for the Mac OS. This isn't anywhere near complete, and is wrong in a few
important regards, but I think it's heading in the right direction.
[originally from svn r2953]
unitab_xterm. Most linedraw characters display correctly, but it's clear
that RDB and Apple disagree on some of the mappings.
[originally from svn r2601]
This doesn't include any mkfiles.pl glue, and is missing one or two other
fixes. The terminal emulator is kind of working, though, as, I believe, is
the store module. Everything else is yet to be done.
[originally from svn r2226]