* CALENDAR, AOFD: Calendar had a Y2K problem, AOFD did not allow string-streams to reopen
There still may be some Y2K issues, I fixed the obvious ones, including how it interacted with Tedit
* try recompiling
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Co-authored-by: Larry Masinter <LMM@acm.org>
* Eliminate string arguments to OPENTEXTSTREAM #666
Empty string replaced by NIL, mostly. Otherwise, string wrapped in OPENSTRINGSTREAM. TEDIT hasn't yet been modified, just all the callers.
* INDEX, NGROUP: move to obsolete #667
* HELPSYS: Add proper FILETYPE property
* ROOMS files: Also updated for TEDIT string arguments
