[Groff] Compression support for files?

[Steffen Nurpmeso]

Hello,

inspired by a DragonFly BSD commit that i accidentally stumbled
upon (must have been near a release notice; by Matthew Dillon
(dillon AT apollo DOT backplane DOT com), [84d7c06], 2014-05-20)
i've coded something the last two days which seems to work from
the light testing i've done sofar.
It effectively adds compression support for (practically) *all*
files that groff uses during a run.  E.g., after creating an
installation i did

  $ cd $HOME/usr/share/groff/1.22.2/
  $ find . -type f -exec bzip2 '{}' ';'
  $ cd xy; mv nail.1 nail.xx; bzip2 nail.xx
  $ groff -mdoc -Tutf8 nail.xx|v

and it shows the manual as desired; it also works for PS, PDF etc.
output. The `1.22.2' directory shrunk from 5600 to 2200 KB, but
the win can be massive for large font files.
It's a draft (it simply assumes presence of zcat(1), bzcat(1) and
xzcat(1) and in the $PATH, no work on that terrible autoconf stuff
yet) but maybe someone likes it.
Applies to [master].
Ciao,

--steffen

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