ci currently doesn't parse the -x flag at all, defaulting to ",v/" every

time.  I rewrote checkin_choose_rcsfile() to handle it using these rules:
 - If a directory structure is given (ci -x,abcd dir/dir2/file) then all
   RCS files are under dir/dir2.
 - If the RCS/ directory exists, use it.  Otherwise use current directory.
 - If the -x flag is specified, use those slash-separated extensions.
   Otherwise, use the default (",v/").
 - Look in the rcs directory (RCS/ or current directory) for a file
   with a matching extension, for each extension.  Each extension is
   tried in order.  If a file exists, it is used.  If no file exists
   with any extension, the first one is used.
 - The empty extension is treated as no extension, because I can't
   figure out what its special meaning is.

It sounds complicated, and the code is kinda complicated as well, but it
makes sense if you think about it.

ok niallo

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