Provide man.sun implementing .TX.

Improve GROFF_PRINT macro in acgroff.m4.

Guess value for `g' variable.

Guess appropriate value for tmac_m and tmac_s
(if /usr/lib/tmac/tmac.s or /usr/local/lib/groff/tmac/tmac.s exists
and is not the groff -ms macros then install as -mgs else install as -ms).

Put all dev* files in a separate subdirectory `font'.

Provide a `check' target.

Provide a `bindist' target.

Implement tmac.bib in terms of tmac.s.

Support long options using GNU getopt.

Catch the following error in -me:
.(z
.(l C
.)z

Arrows for next/previous page from R5 xditview.