+3 ROM Bugfixes

The original +3 ROMs contained a number of bugs, some of which have been fixed in the +3e. Here is a list of the bugs corrected so far:

CAT can now display more than 63 files
CAT now correctly display sizes greater than 999K
LOAD/SAVE/VERIFY/MERGE commands now correctly strip the "T:" specifier from tape drive filenames
control code handling in printer output routine fixed
COPY...TO command no longer overwrites parts of the program in memory
strobe handling in printer output routine fixed, which should make more parallel printers compatible with the +3e (I have been unable to test this, so please let me know!)
When clearing an FCB, +3DOS no longer overwrites the user area of the following FCB
COPY...TO command no longer fails if drive M: does not exist; instead RAM in page 7 is used.
spurious "end of file" error can no longer occur on printer output.
fixed stack overflow problem with ineffective Editor keys.
fixed PIP duration in Editor.
fixed lower-screen editing mode problems (line loss)
GOTO beyond end of program renumbered to 9999
fixed characters migrating before ">" or "<" in Editor
fixed syntax error position calculation bug
removed HALT instruction in error reporting routine
fixed CLOSE # crash on already-closed streams (this bug is still present in 48K mode)

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