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2e0ebb5392
removed the need for p-string routines, so they were removed. Also removed alloc256/free256 and associated data structures. In removing calls, found instances in pwd & prefix commands and prompt handler where current directory name was assumed to be < 256 characters; recoded to use a flexible buffer size. Updated and expanded mmdebug.asm routines that perform error checking on memory management calls. Added macros ~NEW and ~DISPOSE that invoke either the real or debug routines. Fixed call to read $TERM variable's length to fix PR#81. Removed echo of data when setting value of $< in expandvars (expand.asm). The characters are echoed as they are typed and do not need to be reprinted on stdout after carriage-return is typed. Added error checking to the various flavors of prefix (just like cd): - Verify 2nd parameter is a valid directory before setting. - Verify 1st parameter < 32 before displaying or setting.