* 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
* Duplicate POSTSCRIPT files in LispUsers and LispUsers/POSTSCRIPT
* DICOLOR on LispUsers is old version uncompiled 1985; version on internal library is newer
* missed PS-TTY in the postscript files
* Fix .gitignore no longer need diff filter; remove odd extra ~ file
* Verified POSTSCRIPT lispusers subdirectory redundant (not same hash because of EOL. POSTSCRIPT-old apparently was older version, copyright not venue
* Save postscript-old in obsolete
* move internal/library/DICOLOR to obsolete
