sc 'x' command should set modflg

[Robert Bond]

>From article <818 at cresswell.quintus.UUCP>, by ok at quintus.UUCP (Richard A. O'Keefe):
> The 'x' command in SC wipes out the current cell, but SC doesn't notice
> that the spreadsheet has changed, so if you exit with the 'q' command
> it will not offer to save the changed file.  I found this out the hard way.

Richard is right.  The fix is to add a line like

	modflg++;

in the case statement for 'x'.  It's about line 1064 in version 5.2 of
sc.c.  I'll publish a patch after I accumulate a few more bugs.

					Bob
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