CHANGES BETWEEN 7.15 and 7.16:
Chuck Martin
	-The marks for the last nine edited cells are now updated properly
	 even if the data entered or edited is a string constant.
	-When assigning a numeric value to a cell with = (or "let"), the
	 numeric part of the cell will be cleared if no expression or value
	 is specified (e.g. "let A0 =").
	-Fixed a bug that caused references to cells in rows 0-3 to some-
	 times be incorrect when copying.
	-The vv command now increments modflg properly so sc knows that the
	 file has been modified.
	-Added vi-like abbreviations, defined with the abbrev command and
	 undefined with the unabbrev command (shortcut key is ~).  See the
	 man page for usage details.
	-When in navigate mode, ^V now acts like the ESC key, which allows
	 you to use ^V^V to disable expansion of abbreviations, as in vi.
	 You can still use 'v' to insert the numeric value from the current
	 cell into the command line.
	-Added support for POSIX regex functions (regcomp() and regexec()),
	 using extended regular expression syntax, and made it the default
	 in the Makefile.  Also combined all regex variables into a single
	 variable in the Makefile.
	-Rewrote the code that copies a marked cell.  This fixes several
	 problems: the is_cleared and may_sync flags are now correctly set
	 (thanks to Michael Karcher for bringing that bug to my attention),
	 sc will no longer copy into a locked cell, and copying a blank cell
	 into a nonblank cell now clears the nonblank cell (it previously
	 had no effect).
	-When in quick numeric entry mode and a command is started using
	 a digit or the +, -, or . keys, any cursor movement while the
	 cursor is at the end of the line and the line ends with a + or -
	 will automatically switch to navigate mode.
	-The "+" key now works like "=" if the numeric part of the current
	 cell is empty, except that the entry will begin in navigate mode.
	 If quick numeric entry mode is enabled, after switching to insert
	 mode the first time, the cursor keys will behave as if the entry
	 was started with a digit or decimal.
	-When defining a range in navigate mode and the character immedi-
	 ately preceding the cursor is either a + or -, or the cursor is
	 at the beginning of an empty "let" expression, pressing + or -
	 will insert "@sum(" into the line, followed by the range, followed
	 by ")" and then the character pressed (either + or -), and will
	 remain in navigate mode.  Pressing TAB, :, or . in such a case
	 will do the same thing, but without the final + or -, and without
	 remaining in navigate mode.
	-Pressing the space bar in navigate mode while highlighting a range
	 will enter the highlighted range in the command line, followed by
	 a space, but will remain in navigate mode.  Otherwise, it will
	 move forward a column, as before.  This is handy for entering
	 copy, move, or frame commands, for example, which accept more
	 than one range in the command.
	-The openrow command now works like the 'o' command instead of the
	 'i' command, as it should.
	-When adding or deleting a note, modflg and FullUpdate are now
	 always incremented so that the the screen is updated properly and
	 the change is saved if necessary.
	-When deleting rows in a framed range, the frame is now adjusted
	 properly all the time, regardless of how many rows are deleted.
	 Also, if all of the inner range rows are deleted, the frame is
	 removed.
	-Removed clear() from the goraw() function to avoid screen flicker
	 at the end of a macro, and added a clear() after each goraw()
	 function call that still needed it.
	-Removed #includes for getopt.h and added one for unistd.h in
	 psc.c because getopt.h is only necessary for GNU long options,
	 which sc and psc don't use.
	-Removed the "#" prefix from backup file names, leaving only the
	 trailing "~", which is more standard practice.  This was in
	 response to a suggestion forwarded to me from the Debian Bug
	 Tracking System (although it technically wasn't a bug).
	-The umask is set to 0 before creating backups, and then reset to
	 its original value afterwards, so that the backup file will have
	 the same identical permissions as the original file.
	-Backup files now retain the modification time of the original
	 file before it was modified, and also the user and group ids, if
	 possible.
	-The -P command line option can now accept "%" as its range, which
	 is interpreted to mean the whole spreadsheet.
	-There is now a -W command line option that works similar to the -P
	 option, except it uses the write command instead of the put command,
	 and it takes a single range as an argument, which may be "%" to
	 designate the whole spreadsheet.
	-User-defined formats may now be edited instead of having to re-enter
	 them from scratch.
	-Rewrote much of the history search code so that it works much better
	 than before and allows both forward and reverse searching.  Also
	 added regular expression handling to the history search functions.
	-When searching or navigating the command line history, a message
	 is shown on the error line (2nd line) telling which line of the
	 history you're currently looking at.
	-If a cell uses a format that hasn't been defined yet, and isn't one
	 of the predefined formats, it will now cause the cell to be blank
	 instead of containing random characters.  Thanks to Hartmut Henkel
	 for reporting this bug.
	-All user-defined formats are now cleared in erasedb(), such as when
	 loading a new file.
	-When copying, if the destination range has fewer rows or columns
	 than the source range, the area to be cleared before copying will
	 be expanded to the same number of rows or columns as the source
	 range to prevent there being unexpected data in the "holes".
	-In the copy() function, added a call to sync_refs() after erasing
	 the destination range, but before doing the actual copy, to prevent
	 messing up color ranges, frames, ranges in expressions, or named
	 ranges.
	-Range commands are now initiated with "r" instead of "/".  The "/"
	 key will be mapped to more advanced search (and possibly replace)
	 capabilities later.
	-Strings with embedded, backslash-escaped quotes are now displayed
	 properly, with the backslashes removed.
	-Shell escapes (using "!") now also work while in edit mode.
	-Added @filename(e) function which returns the current default
	 filename.  Expression e determines whether the full path should
	 be returned, or just the base name, depending on whether it is zero
	 or not.
	-If craction is set to move the cursor either down or to the right,
	 autoinsert is not set, and the cell cursor is in the scrolling region
	 of a framed range, the cell cursor will never leave that region, but
	 will always go to the next row/column after entering data in the last
	 column/row of the range.  After reaching the bottom right corner,
	 craction will be ignored.
	-If quick numeric mode and craction are both set, pressing <RETURN>
	 will move in the direction craction is set for instead of switching
	 to input mode with an empty line.
	-Changed test in get_motion() from checking for 0 to checking for
	 '0' (digit instead of NULL byte), so that commands like d0, c0, and
	 y0 (in edit mode) work correctly.
	-If the dollar prescale option is set, all numbers entered with a
	 decimal point will be scaled, even if all of the digits after the
	 decimal point are zeros (or missing).
	-Fixed a bug that prevented sc from remembering the filename when
	 starting with a non-existent filename on the command line (for
	 creating a new file).  Also, added a message stating that a new
	 file is being created if sc is started with a single filename on
	 the command line and the file doesn't exist.
	-All of the commands that take you to the limits of the spreadsheet
	 (0, $, ^, #, and the HOME key) now work differently when invoked
	 inside a framed range.  Depending on where you are, they will take
	 you first to the limit of the inner range, then the outer range,
	 then the whole spreadsheet.  Also moved the code for all of these
	 commands to their own functions in vi.c, since these portions of
	 code were all being duplicated in the navigate mode section of the
	 write_line() function.
	-The last goto can now be repeated (find the next match) by pressing
	 'n'.  All note commands must now be accessed by pressing '*' instead
	 of 'n' to allow this.  To actually go to a note, press '*' twice.
	-Added a new pull command, pullfmt (pf), that works like merge except
	 that only cell formatting is merged, leaving the actual data un-
	 touched.
	-Changed starting value of findfunc in vi.c from '0' to '\0' to fix
	 a bug that caused lockups when using the ; and , commands before a
	 prior search with f, F, t, or T.
	-Swapped the meaning of the ` and ' commands because the ' key is
	 less of a reach on most keyboards (and more standard), and restoring
	 the target cell to its original position on the screen seems to be
	 more useful and more often used than not restoring the position.
	-In closecol(), doformat(), and formatcol() functions, rowsinrange
	 and colsinrange are now reset to prevent occasional lockups when
	 deleting or resizing columns.
	-Moved color initialization earlier in the start-up so that it won't
	 override colors in a file (including the .scrc file).
	-Trying to define color number 0 now correctly results in an error.
	-Fixed support for entering numbers in exponential notation (thanks
	 to Michael Van Biesbrouck for bringing that bug to my attention).
	 Also, disallowed range names that are all numeric except for a
	 single 'e' or 'E' anywhere in the name, because they are ambiguous.
	-Removed the strtof() function, since it partially duplicated the
	 functionality of the standard ANSI C strtod() function (but not as
	 well), and replaced all strtof() calls with calls to strtod() (with
	 a slightly different syntax).
	-Moved the resetting of skipautorun inside the if(eraseflag) block
	 in the readfile() function to prevent it getting reset prematurely
	 (during the reading of the .scrc files) and resulting in the autorun
	 macro being run anyway.
	-If deleting a range of rows, columns, or cells causes the range
	 pointed to by lastfr to no longer exist, lastfr is reset to NULL to
	 prevent a segmentation fault during the next screen update.
	-The copy command now uses the delete buffer as temporary storage
	 for the source range being copied so that if the source and desti-
	 nation ranges overlap, the copy still works.
	-The sync_refs() function now also syncs references in all delete
	 buffers so they will still be correct when pulled (even though the
	 references are adjusted when pulling, they were still occasionally
	 wrong if the cells originally referenced were moved in the meantime).
	-A new copy command, "c.", can be used to copy the current cell into
	 a range which includes the current cell, and which is highlighted
	 by moving the cell cursor.  This facilitates the rapid entry of the
	 same value, string, or expression into a range of cells.  See the
	 man page for details.
	-You can now left justify, right justify, or center all the strings
	 in a range with the "r{", "r}", and "r|" commands, respectively.
	 These operations are also available in macros with "leftjustify",
	 "rightjustify", and "center".
	-When changing column formats, if ESC, ^G, or q is pressed, the
	 original format will be restored.
	-The fixed operator was not working.  It now works, but, like all
	 other keywords, must be preceded by "@".
	-Autoinsert mode now works properly even if the bottom of the frame
	 is of width 0.
	-A new Set option, autowrap, allows data to be entered in a framed
	 range row by row or column by column if craction is not 0, auto-
	 matically wrapping to the next row or column when the end of the
	 scrolling region is reached.  If both autowrap and autoinsert are
	 enabled, autoinsertion only takes place if autowrap would take the
	 cell cursor outside of the scrolling region of the framed range.
	-The "set" command now increments modflg so that sc knows the file
	 has been changed and asks whether to save when quitting.
	-Added vi-like W and B commands to edit mode which only consider a
	 string of one or more spaces to be a word boundary.
	-The @date function can now take an optional second parameter, which
	 is a strftime(3) compatible format string, which will override the
	 default format.
	-All functions which take a single argument now store it as the
	 left parameter instead of the right (e.o.left instead of e.o.right),
	 so that adding an optional second parameter, such as in the @date
	 function in the previous item, keeps the parameters in the correct
	 order when decompiling for display on the top line or saving in
	 a file.
	-When numeric constants are entered which are too large to be con-
	 tained in a double, they are replaced with @err.  When the result
	 of a calculation is too large to be contained in a double, it results
	 in an error.  These fix a dual bug which caused "inf" or "INF" to be
	 displayed (bug 1) and written to a file (bug 2) when saving.  When
	 written to a file, it resulted in an error when the file was read
	 back in the next time.
	-All rows, columns, and ranges that are yanked or deleted now have
	 their respective row/column hidden flags and column width, precision,
	 and format saved so they can be restored appropriately when pulling
	 rows or columns (these were all lost, previously, and the default
	 values were restored, instead).
	-Added a pullcopy command and its interactive shortcut, pC, which
	 acts like pp, except that references are adjusted as in the other
	 copy operations.  Also added a "p." command, which works like pC,
	 except that it allows a destination range to be defined as in the
	 "c." command.
	-When highlighting a range in navigate mode, pressing "o" will move
	 you to the opposite corner of the highlighted range, allowing you
	 to adjust all four sides of the range.  When used with the "c."
	 command, the cell to be copied will always be the cell the command
	 was started in.
	-The deleterow, deletecol, yankrow, and yankcol commands now work
	 properly with no arguments instead of assuming there is a range
	 highlighted.
	-The Z command (for hiding rows or columns) now allows a range of
	 rows or columns to be highlighted using any cursor movement keys,
	 like the d (delete) and y (yank) commands have for quite awhile.
	-The erase_area() function now has a new argument to ignore locked
	 cells which is used when sorting so that locked cells can still
	 be sorted.  Also added an unlock argument to free_ent() and caused
	 the is_locked flag to be copied in the copyent() function so that
	 sorting won't unlock cells.
	-The @sum, @prod, @avg, @count, @stddev, @max, and @min functions
	 may now take an optional second argument which is an expression
	 that is evaluated for each cell in the range, and only those cells
	 for which the expression is non-zero are included in the calculation
	 of the function.  See the man page for details.
	-If rows are inserted into a framed range, note addresses are now
	 updated properly.
	-Logical NOT (~ or !) now always decompiles to "!" instead of "~"
	 for display or writing to a file.
	-In the O_VAR case in the seval() function, check to make sure that
	 ep is not NULL before checking if it has a label to prevent possible
	 segfaults with the seval command, and also changed its name to vp
	 for consistency with the O_VAR case handling in eval().
	-In doseval(), check the return value of seval() for NULL before
	 using it to prevent segfaults with the seval command if the ex-
	 pression given to seval isn't a valid string expression.
	-Fixed a bug that prevented a string expression that currently
	 evaluated to a null string from being written to a file with the
	 put command by testing for either a non-null string value or a
	 string expression in the cell instead of just the former.
	-Moved "FullUpdate++" outside of "if (eraseflg)" block at the end
	 of the readfile() function in cmds.c so that the screen is updated
	 properly after a macro.
	-Added a getkey command for use in macros to get a single key from
	 the user instead of a string.  Handy for "hotkeys" or "Press any
	 key..." type things.
	-Changed two instances of update(0) to refresh() in formatcol(), and
	 added another refresh() after update(1) later in the same function
	 because the screen wasn't being refreshed properly in FreeBSD.
	-Added a ^L option to redraw the screen while formatting a column.
	-Added -ffloat-store to the compiler command line for interp.c to
	 fix intermittent error with @round function as well as some other
	 problems caused by the FPU registers in x86 machines, and possibly
	 others, having different precision than doubles in memory, and
	 removed some previous workarounds for some of these problems.
	-Braille mode now positions the cursor at the far left of the current
	 cell and also moves the column names to the left edge of the column,
	 which works better with screen readers such as SpeakUp while still
	 retaining all of its advantages for braille readers.
Michael Lapsley
	-Added @lastrow and @lastcol functions, useful for macros designed
	 to default to the whole spreadsheet.
	-Added getrange command for use by macros to check if a given named
	 range exists without causing an error, and return the actual range
	 if so.
	-Added a history file (default: ~/.sc_history) to carry the command
	 history from one session to another.
	-Added ability to interface with plugins (external programs for
	 adding commands to sc and converting files with user-specified
	 extensions automatically when reading or writing).
Wilhelm B. Kloke
	-Pointed out problems with arrow keys in nmgetch() when BSD43 is
	 defined due to changed ^B and ^F behavior, causing arrow keys to
	 work incorrectly on FreeBSD.  Also, similar changes were necessary
	 for VMS when SIMPLE is defined.
	-Add "optreset = 1" to -P option handling when BSD43 is defined so
	 the -P command line option will work properly on FreeBSD.
Hartmut Henkel
	-Added locale support.
	-Rewrote dodate() function to use strftime() because ctime() doesn't
	 honor locale.
	-Changed PI macro to M_PI, which is standard in math.h.
	-Changed sprintf() to snprintf() in dofmt() function to prevent
	 potential segmentation faults.
	-Added isascii() check in addition to existing isalpha() check to
	 prevent invalid address problems in some locales.
TJ Dvorachek
	-Time types in interp.c have been changed from long to time_t and
	 the time() prototype in dotime() is redundant and has been removed.
	-Provided information for creation of a DJGPP section in the Makefile.
	-In the signals() function in sc.c, the SIGBUS signal handler is not
	 set when compiling with DJGPP because it lacks SIGBUS.

CHANGES BETWEEN 7.14 and 7.15:
Chuck Martin
	-Fixed "``" and "''" bug, introduced in 7.14 (they weren't being
	 accepted).  I guess 7.14 was released too soon after last minute
	 changes, without sufficient testing.
	-Fixed format bug that caused segfaults when there was no decimal
	 point in the format string, also introduced in 7.14 last minute
	 changes.
	-When entering insert mode with '+' or '-', and the cell already
	 contains a numeric value or expression, the edit is now saved in
	 the dot buffer, as it should be.
	-Don't save the current position (for the "`" and "'" commands)
	 during a goto in a macro.  Also, don't save the current position
	 during any movement command where the current cell doesn't change
	 (leave the saved position pointing to the last position before an
	 actual move).

CHANGES BETWEEN 7.13 and 7.14:
Chuck Martin
	-Added a braille option ("set braille" or ^Tb) with two different
	 modes, which makes use of braille displays with sc much easier
	 by judicious placement of the hardware cursor.
	-The "cellcur" option (current cell highlighting) is no longer
	 saved with a file, since it's more likely a user preference
	 and/or terminal dependent, and is more appropriate for use in a
	 user's .scrc.
	-Split the last fprintf() in list_frames() so that the outside
	 and inside ranges will be different (as they should be), even if
	 neither is a named range, since r_name() uses a single static
	 buffer.
	-The range copy command (/c) with only one argument will now use the
	 highlighted range as the source if one is highlighted.  Otherwise,
	 it will copy the last copied range, as before.
	-The range copy command (/c) with no arguments will now use the
	 highlighted range as the destination, if one is highlighted, and
	 the last copied range as the source.
	-The addnote command with only one argument will now use the
	 highlighted range if there is one, and the current cell otherwise,
	 as the range to link to the cell specified by the single argument.
	-The frame command with a single argument will use the highlighted
	 range, if any, as the inside range, and the single argument as
	 the outside range.  If no range is highlighted, the single argument
	 will be used as the inner range, and the existing outer range
	 containing the current cell will be used as the outer range, which
	 which was the previous behavior whenever a single range was speci-
	 fied.  If the current cell is not in an existing framed range, an
	 error message will be issued.
	-The frame command may now be used without any arguments, provided
	 a range is highlighted (which will be used as the inner range)
	 and the current cell is in a framed range whose outer range is to
	 be used as the default outer range.
	-Fixed a bug that prevented defining a new range with a name that
	 was the same as the beginning of a previously defined longer
	 range name.
	-A new command line option, -a, will skip the autorun macro if
	 one is defined.
	-Bug fix: if a cell contains a string expression, but no numeric
	 value, pressing "e" to edit the non-existent numeric value will
	 no longer bring up the string expression for editing (it wouldn't
	 work, anyway, because string expressions don't work with the "let"
	 command).
	-You can now use the cursor keys with ^Tr to set craction.
	-In numeric mode, entering insert mode by pressing a digit, '+',
	 or '-' will cause the cursor keys to terminate an entry and
	 move the cell cursor in the desired direction.  Switching to
	 edit mode will change the cursor keys back to their normal
	 function (moving the cursor in the command line or history), even
	 after switching back to insert mode.
	-Fixed @index function so that indexing by both row and column
	 will still work even if there is only one row or one column
	 (so that, for example, a macro could generically access the
	 cell in the first row and first column of a range without
	 regard for the actual dimensions of the range).
	-All flags are turned off in the clearent() function except
	 is_changed and is_cleared, which are turned on.  Also, the
	 is_cleared flag is turned off in the fill() function after the
	 cell is cleared and then assigned a new value.  This prevents
	 errors from appearing in expressions which reference cells in
	 the filled range whenever the sync_refs() function is called,
	 which happens any time any cell or range of cells is yanked,
	 deleted, pulled, copied, or moved.
	-Each instance of @ext now saves its own previous value, which
	 eliminates the longstanding bug that caused the last returned
	 value to be used for all instances if external functions were
	 enabled and later disabled.
	-Added a % command in edit mode that finds the matching parenthesis
	 of a pair, as in vi (only works for parentheses, not for braces
	 or brackets).
	-When starting a new command, the dot buffer will not be altered
	 unless the command starts out in edit mode (like the "e" and
	 "E" commands).  All other commands will only alter the dot buffer
	 after entering edit mode for the first time.  This allows things
	 like editing data, using "goto" to jump to a new cell, and then
	 "." to make the same change to the new cell (previously, the
	 "goto" command caused the previous edit to be lost from the dot
	 buffer).
	-Numeric arguments are now saved for use with the dot buffer when
	 editing a line, so the same argument will be used again when
	 repeating the action with the "." command.
	-If a command line is identical to the last command in the history,
	 it won't be stored in the history again.
	-The copy and move commands (/c and /m) no longer have an effect
	 on the delete buffer.  This allows you to do things like delete
	 a cell or range of cells, move things around in the spreadsheet,
	 and then pull the deleted cell(s) back in.
	-Implemented named buffers, "a" through "z" and "0" through "9",
	 selected with the " key.  Buffers "1" through "9" hold the last
	 nine deletions, as in vi, and buffer "0" holds the last cell or
	 range of cells yanked, as in vim.  See the man page for details.
	 (A "select" command was also added to allow the use of named
	 buffers in macros.)
	-The format command now rejects a width of zero.
	-Column headings over columns of width 1, 2, or 3 are now displayed
	 properly.  If the width is 1 and the column name is two characters,
	 only the second character will be displayed in the heading.
	-In navigate mode, v and ^V now place the numeric value from the
	 current cell into the command line, freeing up the ^A command
	 to be used as a synonym for the HOME key, as it is when not editing
	 a line.
	-KEY_RESIZE is now handled properly so an error message is not
	 issued whenever an xterm window is resized.  If SIGWINCH is
	 undefined, KEY_RESIZE resizes the spreadsheet to fit the window.
	 otherwise, it is ignored, since the SIGWINCH signal handles the
	 resizing.
	-Pulling the same range several times now works correctly.  Pre-
	 viously, some cell references were being altered after the first
	 pull under certain circumstances.
	-Internal references are now adjusted properly when pulling a range
	 with "pt" (pulltp).
	-The -R and -C command line options now work properly again.
	-The pull merge command (pm) now actually does a merge, instead of
	 overwriting the destination cells, and a new pull command (paste,
	 or "pp") pulls a cell or range after first erasing the destination
	 cells.  For macros, pull does the paste, while pullmerge does the
	 merge.
	-The f (format) command now allows you to interactively change the
	 column width, precision, and format number as well as enter these
	 values on the command line as before.  See the man page for details.
	-The "&" in the fractional part of a custom format type now works
	 properly even if the precision is one.
	-When using "&" in a custom format type, and there are literal
	 characters after the fractional portion, they will now be included
	 properly even when the precision is zero.
	-Removed the "fill x y" (where x and y are numbers and the range
	 is supposed to be highlighted) form of the fill command, since
	 its usefulness and convenience leaves much to be desired the was
	 sc now handles the /f command.  It's much easier to use the full
	 form now.
	-Added marks '1' through '9' to remember the locations of the last
	 nine edits, and '0' for the current (or last, if not editing) edit.
Hartmut Henkel
	-When saving a range with "Put", the "format" and "hide" commands
	 are now written for the last column of the range, if necessary
	 (needed to change a "c < cn" to "c <= cn" in the write_fd()
	 function in each case).

CHANGES BETWEEN 7.12 and 7.13:
Chuck Martin
	-New column formats may now be defined with "format # = string",
	 where # is a number from 0-9, and string is a format string like
	 that used for formatting individual cells.  Numbers 0-4 will
	 replace the default formats (causing the precision value to be
	 ignored), and numbers 5-9 will add new ones.
	-Format strings now interpret "&" in the fractional part to mean
	 that the column precision should be used.  This allows user
	 specified formats to have their precision vary from column to
	 column without having to create multiple formats (see the previous
	 item).
	-The "vr" command now limits itself to the current framed range,
	 if any, like "dr" and "yr".  If not contained in a framed range,
	 it works as before.
	-The "yy" command now yanks only the current cell instead of the
	 current row, as this seems more useful.  Likewise, "vv" converts
	 the current cell from an expression to a constant value, and for
	 consistency, "dd" erases the current cell ("dd" is a synonym for
	 "x" now, instead of "dr").
	-You can now unset mdir and autorun by setting them to "".
	-Both goraw() and deraw() do nothing if stdout is not a terminal.
	 This prevents segmentation faults when using sc non-interactively
	 with redirection or pipes.
	-The redraw command also does nothing if stdout is not a terminal
	 for the same reason as the goraw() and deraw() functions (see the
	 previous item).
	-doquit() and dump_me() no longer try to prompt the user about
	 saving a file under emergency situations such as a broken pipe
	 or kill signal if stdout is not connected to a terminal, which
	 prevents even more possible segmentation faults.  Also, SIGINT
	 is no longer ignored, but calls doquit() instead.
	-Added a "usecurses" variable, and replaced most instances of
	 "isatty(STDOUT_FILENO)" with "usecurses".  The -q option also
	 resets usecurses to 0, so echoing commands to "sc -q" now works
	 from the command line.
	-Added another "usecurses" before the confirmation message in the
	 writefile() function.
	-The error() macro now checks stdout instead of stdin before dis-
	 playing its message.
	-find_char() now checks to see if the last character in the dot
	 buffer is 'f', 'F', 't', or 'T', and if so, stores the next
	 character after it.  This causes these commands to be stored
	 in the dot buffer if they are part of another command (such as
	 'df+'), but not otherwise.
	-Fixed a bug where numeric arguments could not be used in edit and
	 navigate modes if quick numeric mode was set.
	-Added a new command, seval, that evaluates an expression like
	 eval, except it evaluates string expressions instead of numeric
	 expressions.
	-Added KEY_BACKSPACE and KEY_END to the control key handling part
	 of the main loop, and removed KEY_END from nmgetch().
	-Eliminated the hitwinch variable and moved all SIGWINCH stuff into
	 the SIGWINCH handler (winchg()).  Also, changed update() to use
	 getmaxyx() instead of LINES and COLS.  These changes make sc
	 react immediately to resizing xterms (for some reason, this
	 doesn't work with old versions of ncurses--at least not with
	 version 1.9.9g, which seems to require restarting sc to make size
	 changes effective).
	-A new Y command in edit mode that yanks to the end of the line,
	 like y$ (I know this isn't the way Y works in vi, but it's the
	 way it *should* work for consistency [cf. the D and C commands],
	 and the way Y works in vi would be pointless in sc).
	-The "cellassign = 1" in slet() is now only done if the cell being
	 assigned to is the current cell, like it was supposed to (I must
	 have deleted that part by accident somewhere along the line).
	-The /S command now lists named ranges, framed ranges, and color
	 ranges, one after another, along with definitions of any colors
	 that have been changed from the default (no second letter required).
	-Colors may now be unset (reverted back to their default start-up
	 values) by leaving out the expression (e.g. "color 3 =" will
	 set color 3 back to it's original foreground/background pair).
	 Unlike setting it explicitly to its original value, this will
	 not cause the expression to be written to the file when saved.
	-Changed test in pullcells() function for checking if there is
	 data to pull so that instead of testing the actual pointer to
	 see if it's NULL, the index will be tested to see if it's
	 negative.  The old method was causing segfaults if the delete
	 buffer was empty.
	-^A now goes to the beginning of the line in edit and insert modes.
	 It retains its original behavior in navigate mode (the man page
	 already stated that inserting the numeric value of the current cell
	 into the command only works in navigate mode; now the behavior
	 matches the manual).
	-Range names may now begin with a digit as long as there is at least
	 one non-numeric character (alpha or '_').
	-Added range name completion.
	-Fixed a bug that caused range names to match when they shouldn't
	 when parsing a command (a range name would be matched by any
	 string of characters that matched the beginning of the name, so
	 that if "abc" and "abcd" are both defined, an expression using
	 "abc" would end up accessing the wrong range, since the list is
	 searched in reverse alphabetical order).
	-Cells with attached notes are now identified with an asterisk to
	 the left of the numeric portion (using color 4, default black on
	 yellow, if color is enabled).
	-The J, K, PageUp, and PageDown commands now use the pagesize setting
	 even in navigate mode.
	-^B and ^F now do the same as PageUp and PageDown instead of moving
	 left or right one cell.  This is to be more compatible with vi,
	 resulting in less confusion for those who use both.
	-Centered strings are now entered by pressing '\' instead of '"',
	 so that '"' can be used for multiple delete buffers as in vi in
	 the future.
	-If an autorun macro is already defined, pressing 'A' will include
	 it for editing in the command line it brings up, as it should
	 (it wasn't working properly due to a missing else).
	-In openfile(), check if rfd is NULL (signifies opening pipe to
	 process for both reading and writing) before closing unused end
	 of (non-existent) second pipe.  This was causing intermittent
	 lock-ups when only writing to a pipe because stdin was being
	 closed.
	-The screen is no longer cleared or redrawn unless absolutely
	 necessary after a macro is run, since most macros won't need it,
	 and it causes screen flicker.  Macros which need it (those that
	 write directly to the screen, bypassing sc) will need to do an
	 explicit redraw before ending.
	-SIGPIPE now causes a flag to be set (brokenpipe), which is checked
	 a number of places so that nothing more is written to the pipe
	 and an error message is displayed, instead of trying to save the
	 file and quit (an annoyance when all you did was do a /S and then
	 quit before reading the whole output).
	-If the last character in the string in a run command is '&'
	 (signifying the command will be run in the background), the
	 "Press any key to continue" prompt will not be displayed, and
	 sc will continue with no hesitation.  I use this in Linux to
	 load another sc file in another virtual console with "openvt -sw"
	 (assign it to a function key for ease of use).
	-Added @rows and @cols functions that take a range as argument and
	 return the number of rows or columns, respectively, in that range.
	-Added a new error command for displaying error messages from macros
	 (syntax: `error "message to display"').
	-The duprow() and dupcol() functions now put the cursor in the
	 original column or row, respectively, which, among other things,
	 prevents sc from hanging when multiple rows or columns are appended.
	-A `put ""' command (with the empty string) will save the default
	 name even in a pipeline, unless the default name is also the empty
	 string, in which case it will be written to stdout.
	-Removing a function key definition by defining it to be "" (the
	 empty string) now changes the pointer to NULL in addition to freeing
	 the string, as it should.
	-When using goto (g) to jump to a specific cell address (as opposed
	 to doing a search), only save the current address for the `` and
	 '' commands if the destination address is different.
	-When inserting or deleting rows or columns, update the addresses
	 associated with the last explicit goto.
	-Added definitions for color_set() and attr_get() to sc.h for
	 older versions of (n)curses that have missing or outdated versions
	 of these macros (not conforming to X/Open Curses).
	-Colors are now reinitialized in startdisp() (using init_pair()) so
	 that they continue to work properly after resizing an xterm.
	-The -P command line option can now be used without specifying the
	 source range, but the target address must be specified in such a
	 case, preceded by a '/' (e.g. '-P/f23').  In this case, sc will be
	 started interactively in navigate mode so you can highlight the
	 source range you want to import.
	-The -P command line option may now be used more than once, and
	 the specified ranges will be output one after another, however,
	 the -v option must precede each instance of -P whose output is to
	 be converted to values.  This allows multiple ranges to be copied
	 from one file to another without having to load and calculate the
	 entire source file for each of them.
	-The destination given with the -P option may now be specified as
	 either a cell address or a range.  If a range is specified, the
	 upper left corner of that range will be used.  This allows named
	 ranges to be used.
	-The initial allocation of memory for color pairs is now done in a
	 loop instead of eight explicit statements.
	-Undoing changes made to a command now works after using replace mode.
	 Also, backspacing in replace mode restores the original character
	 instead of just deleting the new one and closing the hole.

CHANGES BETWEEN 7.11 and 7.12:
Chuck Martin
	-The yankrow and deleterow commands can now take a numeric argument
	 or two numeric arguments separated by a colon to specify a row or
	 range of rows to yank/delete.  Likewise, the yankcol and deletecol
	 commands can now take a column name or two column names separated
	 by a colon to specify a column or range of columns to yank/delete.
	-Pressing y or d followed by any cursor movement, including PageUp,
	 PageDown, H, J, K, or L, will begin highlighting full rows/columns
	 to be yanked or deleted.  Pressing TAB, '.', or ':' will terminate
	 the highlighting and insert the range of rows/columns in the
	 command line.  Pressing the RETURN key, instead, will yank/delete
	 the default range of rows/columns displayed.
	-Added a pagesize option that can be changed with the set (S)
	 command.  If nonzero, it will determine the number of rows to
	 move up or down when using the J, K, PageUp, or PageDown keys.
	-The PageUp, PageDown, J, and K commands will now be multiplied
	 by a preceding numeric argument like most other commands.
	-An improper test was causing the syncref() function to corrupt
	 expressions which referenced empty cells every time anything was
	 deleted or moved.  This has been fixed (the struct ent now has
	 an additional "is_cleared" flag).
	-When adding a note with "na", automatically start out in navigate
	 mode.

CHANGES BETWEEN 7.10 and 7.11:
Chuck Martin
	-You can now use ~ in edit mode to change the case of a character,
	 just like in vi.
	-In quick numeric mode, the + and - keys now switch to insert mode
	 and append a + or - to the existing numeric entry, respectively.
	 This is so that you can easily add to or subtract from a cell that
	 already contains numeric data.
	-When attempting to edit the numeric value in a cell with e, +, or
	 -, and no value or numeric expression has previously been entered
	 in that cell, you will no longer be presented with a 0 to edit.
	-In navigate mode, the + and - keys now insert the current cell
	 address, followed by a + or -, respectively, and remain in navigate
	 mode, so that other cells may be easily added to or subtracted from
	 the equation.
	-^E can now be used in insert mode to jump to the end of the line.
	-Check to see if $HOME exists before copying it to curfile to
	 prevent segfaults if it's unset.
	-The deraw() function now sets the background to the default colors
	 (white on black) before clearing the last line.
	-If piping from a command (as opposed to *to* a command), as in
	 advanced macros, the cell cursor won't move to the last line and
	 the last line won't be cleared, which avoids unnecessary screen
	 updates.
	-Function key definitions are now saved with a spreadsheet file.
	 It makes more sense to include them with the file than to consider
	 them user preferences for inclusion in a dotfile.
	-Fixed a bug that prevented locked cells from being recalculated
	 (this actually looked deliberate, but I don't understand why, so
	 I "fixed" it anyway). 
	-Locked cells now can't be changed even if the command is entered
	 from scratch at the command line (previously, you were only pre-
	 vented from using =, <, >, or " to enter insert mode while in a
	 locked cell).
	-There are now openrow and opencol commands ("o" followed by "r" or
	 "c") that work like insertrow and insertcol ("ir" and "ic"), except
	 that the new rows/columns are added after the current row/column
	 instead of before it.
	-When adding new rows/columns with a, i, or o, the new cells will
	 always be included in the same ranges (named, framed, or color,
	 as well as those used in an expression) as their counterparts in
	 the current row/column.  This is handy when adding rows/columns
	 at the edge of a range, by moving to the appropriate side of the
	 boundary and using the appropriate command (i or o).  This is
	 actually multiple changes, since each type of range had to be
	 dealt with individually.
	-Added new command line options for use in piping data to another
	 program or redirecting to a file.  These are: "-P range" or "-P
	 range/var" for writing a range in sc format to stdout (the "var" is
	 a cell address used to adjust addresses for inclusion in another
	 file starting at cell address "var"), and -v for causing values to
	 be output instead of expressions when the -P option is used.  This
	 only outputs cell data and formatting, without all of the colors,
	 range definitions, column formatting, etc., that are included with
	 the normal put command or when piping the output without the -P.
	 Also, piping in general has been much improved.
	-When using get to load a new file, all options are reset to their
	 initial defaults, marked cells are unset, etc., and the user's
	 .scrc file is reread.
	-Fixed a bug which allowed strings that are too long for the cell
	 width to slop over into the next cell when they shouldn't (there
	 is data in the next cell, for example).  This bug only occurred in
	 framed ranges.
	-The pipe symbol (|) is no longer required at the beginning of
	 the "pipe" commands.  The way the proper file descriptor is
	 chosen has changed so it's no longer necessary.  This makes it
	 easier to use shell scripts for macros because there's no pipe
	 symbol to quote (it should have been done this way in the first
	 place--I don't know why it didn't occur to me before).
	-Added a "status" command for use in advanced macros that will return
	 information about the current state, such as whether the file has
	 been modified and whether stdin or stdout is connected to a terminal.
	-Added an "eval" command for use in macros to evaluate an expression
	 without storing it in a cell first.  This is a pipe command so the
	 result will be piped to the macro.
	-Added a -q command line option to force sc to exit immediately
	 after reading all files, including stdin, if that is being read
	 as a file.  This is useful for getting information from a file
	 without entering it interactively (e.g. echoing the eval command
	 to sc from a shell script, effectively using sc as a command line
	 calculator).
	-Defining a function key as "" (the empty string) will effectively
	 undefine it, so it won't be written to the file when saving.  When
	 used with F1, this restores the default behavior of reading the
	 man page.
	-After doing a goto, update() is called, so that following a goto
	 by a whereami in a macro will return the correct second address
	 (the upper left corner of the current screen).
	-^E and ^Y both work in navigate mode now.  ^E works both for
	 scrolling and going to the end of a blank/non-blank region.  The
	 END key also works in navigate mode.
	-Fixed problem in the range commands (those initiated with a "/")
	 where the cursor wasn't being positioned properly at the end of
	 the command line due the the recent change in how insert mode is
	 entered (for making the dot buffer work properly).
	-Simplified logic for doing autorun macros.
	-When starting to define a range from navigate mode with the TAB,
	 ".", or ":" keys, a space is no longer inserted into the command
	 line (there was an "ins_in_line(' ')" in the wrong place).
	-Added a new function, @err, that forces an error.  If rows or
	 columns are deleted and not pulled back in, all references to
	 cells in those rows/columns will be replaced with @ERR until they
	 are pulled back in (@ERR is equivalent to @err, but the caps show
	 that it is due to a deleted cell being referenced).  If the
	 spreadsheet is saved to a file before pulling, the @ERR will be
	 saved as a part of the expression, and will show as @err (lower
	 case) after being read in again, since the deleted cell can no
	 longer be restored.  This is so that it can be fixed in a later
	 session.  Previously, the whole expression was lost if there was
	 an error when the file was saved and reread.  Also, if another
	 deletion is performed before pulling the last one in, all instances
	 of @ERR will change to @err, showing that these references may
	 no longer be restored.
	-Fixed a bug when inserting columns at the end of the scrolling
	 portion of a framed range, which caused formulas referencing the
	 last cell in the scrolling portion to reference the new last cell
	 (in the last newly added column) instead of the old one.
	-Added a command to sort the rows in a range according to either
	 numeric or string data (or both) in one or more columns.  See man
	 page for details.
	-Added a "cslop" option (short for "color slop"), disabled by
	 default, which, when disabled, prevents long strings from slopping
	 over into a cell in a different color range, even if there is no
	 data in it.  When enabled with "set cslop" or ^Ts (to toggle it),
	 this slopover will occur regardless of whether there is a change
	 in color range or not.  The default is very handy in framed ranges
	 to get more data on-screen by including only the beginnings of row
	 identifiers in the frame while maintaining a cleaner look, while
	 enabling cslop still allows you to see the full string.
	-All options which can be disabled by using ! with the set command
	 can now use ~ instead (handy for shell scripts because it doesn't
	 need to be quoted).  Some options worked this way before, but it
	 wasn't consistent.
	-The move command will now accept the currently highlighted range
	 as its second argument even if you don't press TAB, ".", or ":"
	 to enter it into the line.

CHANGES BETWEEN 7.9 and 7.10:
Chuck Martin
	-Implemented "dd" command as a synonym for "dr" and "yy" as a
	 synonym for "yr" (similar to the way these commands work in vi).
	-Added a vi-like y (yank) command to edit mode which copies from
	 the command line to the text delete buffer without deleting.
	-Added two more goto commands: `goto #"regex"' to do a regular
	 expression search through formatted numbers, and `goto %"regex"'
	 to do a regular expression search through expressions.  Both of
	 these may take an optional range argument to limit the search
	 to a specified range.
	-Added a |getframe command for use in macros to return the outer
	 and inner ranges, respectively, of a frame, separated by a space.
	-You can now scroll up and down without moving the cell cursor
	 using ^E and ^Y, as in vi.  Since ^E also has another function,
	 it only scrolls when immediately following a ^Y or another ^E.
	-Corrected man page which still erroneously stated that C centers
	 the current cell (it is now used to define a color).
	-ZZ now only writes a file if it has been modified.  It also gives
	 an error message if there is no default file name.
	-If cell highlighting is turned off while color is on, the cell
	 pointer (<) no longer leaves a trail through colored ranges (I
	 don't know why anyone would use this combination of options, but
	 it's fixed, anyway).
	-When writing a range with the put (P) command, format commands
	 for columns outside the specified range are no longer written.
	-Removed "#include <stdio.h>" from sc.c, vi.c, and xmalloc.c, since
	 this is redundant when curses.h is included.
	-Added an autorun command (shortcut "A") to specify a macro to be
	 run automatically as soon as the file finishes loading.  Autorun
	 macros will not be executed from a file which is merged (such as
	 another macro).
	-When uninstalling, $(LIBDIR) (default: /usr/lib/sc) is removed
	 completely, instead of just its contents.
	-When used in a pipeline rather than a terminal, the format command
	 doesn't try to resize the column because the format is "too large"
	 for the screen, which resulted not only in negatively sized
	 columns, but also segmentation faults when switching to interactive
	 mode.
	-Initialized variable "pid" to 0 in readfile() function in cmds.c
	 to eliminate potential hangs when closing a file after reading.
	-A message was added to let you know when a file is being read so
	 it doesn't look like the program hung when reading a large file.
	-When switching from reading from a pipe to interactive mode, there
	 is now a stopdisp() before the freopen() and a startdisp() after
	 to make sure the curses initialization is done properly.
	-Now checks to see if the stdin is a tty before trying to check
	 if the terminal has colors (curses has_colors()) to prevent
	 segfaults when run in a pipeline.
	-Modified both the sc and psc man pages for a more consistent
	 look.
	-You can now use numeric arguments in the middle of a command in
	 edit mode, as well as the beginning.  For example, d3w and 3dw
	 both do the same thing.  If you do both, they will be multiplied.
	-sc now uses getopt() to parse its options.
	-If stdin is not a terminal (as in a pipeline) and a filename of
	 "-" is not given, stdin will be merged in after all files on the
	 command line have been processed.
	-Added a modflg++ to the frame-handling part of the deleterow()
	 function in cmds.c so that deleting a row in a frame will cause
	 you to be prompted to save the file if you quit.
	-Added an autoinsert option and toggle (^Ti) to automatically
	 insert a row/column each time the last row/column is filled in
	 the scrolling portion of a framed range if craction is set to
	 move the cell cursor so that it moves outside this range.
	-Marked cells are now updated properly when inserting or deleting
	 rows inside a framed range.
	-In both edit mode and navigate mode, "v" is now a synonym for ^V.
	-Moved savedot() out of vigetch() in vi.c so that the f, t, F, and
	 T commands wouldn't be saved for repeating with the dot command.
	 Added a ";" and "," command to repeat these commands instead, as
	 in vi (the latter reverses the direction of the search).
	-Replaced all instances of "insert_mode()" in the main loop in sc.c
	 with "edit_mode; write_line('A')" so that they are written into
	 the dot buffer properly.
	-Pressing RETURN in insert mode enters an ESC into the dot buffer
	 instead of a ^M so that the dot command only repeats the last
	 change, without automatically ending the input.
	-Removed a sync_refs() from the frame-handling section of insertrow()
	 in cmds.c so that deleting and then pulling a row in a framed range
	 doesn't mess up expressions that referred to cells in that row.
	-When not editing a line, ^A goes to A0 like the HOME key.
	-Navigating with the HOME key, ^A, 0, ^, $, or # now saves the
	 current position for returning with `` or ''.

CHANGES BETWEEN 7.8 and 7.9:
Chuck Martin
	-Fixed a bug where cells in the delete buffer were having their row
	 and column numbers changed each time they were pulled to match the
	 last pull address instead of keeping their original values.
	-Added two more options for the 'p' (pull) command, in addition
	 to 'pr' (pull rows), 'pc' (pull columns), and 'pm' (pull merge).
	 These are 'px' (pull exchange), which works like 'pm', but instead
	 of leaving the contents of the delete buffer unchanged, exchanges
	 the cells in the delete buffer with those being overwritten; and
	 'pt' (pull transpose), which works like 'pm', but transposes the
	 rows and columns while pulling them into the spreadsheet.  Also
	 added equivalent commands for use in macros: pull (pm), pullrows
	 (pr), pullcols (pc), pullxchg (px), and pulltp (pt).
	-Fixed bug when inserting rows at the end of the scrolling portion
	 of a framed range, which caused formulas referencing the last cell
	 in the scrolling portion to reference the new last cell (in the
	 last newly added row) instead of the old one.
	-Added a 'yankrow' and 'yankcol' command for macros, and 'yr' and
	 'yc' equivalents for the user, which work like /y, but work on
	 whole rows or columns instead of a range.  'yr' is limited to
	 the current framed range, if any, just like the other row commands.
	-When deleting, yanking, etc., the upper left and lower right cells
	 of the range are allocated if they don't exist, so that pulling
	 them back in will always work correctly, even if all the cells
	 in one or more edges of the range being erased are empty.  Pre-
	 viously, they might be offset due to the pullcells() function
	 using the minimum and maximum rows/columns of any cell in the delete
	 buffer to determine the range being pulled.
	-The closecol() function now only takes one argument, since the
	 first argument was always curcol whenever the function was called.
	-If the color option is the only one that has been changed, it
	 will still be saved in the file (the test was reversed).
	-Cells may now be marked while in navigate mode.
	-Can now 'goto' a cell, range, etc., while in navigate mode, without
	 losing the command line being entered.
	-Added a |query command that allows a macro to display a question
	 or message and obtain information from the user.
	-The 'run' command now frees up the space allocated to the command
	 string being run after it's through.
	-Removed a '+1' from the coltoa() function because it was causing
	 the column returned to be off by one.
	-Moved the gmyrow and gmycol variable assignments to the beginning
	 of the RealEvalOne() function so that @myrow and @mycol work not
	 only in numeric expressions, but also in string expressions.
	-Two variables in screen.c seemed to serve the same purpose.  These
	 were lastcol and lastcurcol.  All occurrences of lastcurcol were
	 changed to lastcol to eliminate the redundancy, and lastcurrow
	 was changed to lastrow for consistency.
	-Numeric arguments are now accepted in edit mode and navigate mode.
	 For now, the numeric argument must precede the whole command, rather
	 than come in the middle.  For example, "3dw" works; "d3w" does not.
	-The f, F, t, and T commands in edit mode now work properly even
	 if the cursor is currently on a character matching the one being 
	 searched for.
	-More bugs fixed in screen.c dealing with framed ranges, one which
	 was causing the row labels at the left of the screen to disagree
	 with the actual cells being shown under certain circumstances.
	-Many more minor changes and bug fixes I've forgotten, and don't
	 have the time to figure out from the diffs.

CHANGES BETWEEN 7.7 and 7.8:
Chuck Martin
	-Separated most of the code for framed ranges into its own file.
	-Inserting, deleting, or appending rows while in a framed range
	 now only effects the framed range you're in.  The old behavior
	 of inserting, deleting, or appending the row or rows all across
	 the whole spreadsheet is still the default behavior when done
	 outside of all framed ranges.
	-Inserted columns are never hidden when created.  Previously, the
	 hidden flag was copied from elsewhere, resulting in new columns
	 potentially being hidden for no apparent reason.
	-Columns may now be inserted at the end of the scrolling region of
	 a framed range.  Previously, they were added to the bottom of
	 the frame instead.
	-Changed the behavior of the delete row/column (dr & dc), the
	 delete range (/x), and the delete cell (x) commands so that
	 subsequently pulling the deleted row/column/range into another
	 part of the spreadsheet will cause references to external cells
	 to continue to point to their original locations.  References to
	 deleted cells show as "ERROR", but pulling the cells back in
	 restores the references.
	-Implemented a "move range" (/m) command, which, unlike deleting
	 and pulling, will cause all cell references to move with the
	 range (both internal references to external cells and external
	 references to internal cells; see the man page for more informa-
	 tion).
	-Implemented a "yank range" (/y) command, which copies a range
	 into the delete buffer without actually deleting it.
	-The range-copy command (/c) may now be used without arguments,
	 or with only the destination specified.  See the man page for
	 details.
	-Implemented colors and color ranges, with the ability to base
	 foreground and background colors on a calculation or test, and
	 to set colors differently for negative numbers or cells with
	 errors.  See man page for more information.
	-Writing a file now gives a message telling what it's doing,
	 instead of only after it's done (useful for large files, so you
	 know it probably didn't lock up).
	-The `, ', and * commands now work in navigate mode.
	-The yn_ask() function in cmds.c now ignores anything except y, Y,
	 n, N, ESC, and ^G, instead of giving an error message and returning.
