Make man pages more customizable.

* tmac/an-old.tmac (FT): New register holding footer distance from
bottom.
(HF): New string holding the default heading font.
(TH): Handle registers `IN' and `SN' set on the command line.
Use `FT'.
(PT, BT): New strings to customize header and footer lines.
(an-header, an-footer): Use them.
(SH, SS): Use `HF'.
* tmac/groff_man.man: Document changes.

* doc/groff.texinfo: Document man changes.
Document Ultrix extensions of man.

* src/roff/troff/input.cc (do_width, do_if_request): Reset
`have_input' after changing back to old environment.

* src/devices/grolbp/lbp.cc (lbp_printer::set_line_thickness): Move
function up to be defined before first call.  This is necessary to
avoid a compilation problem with Sun's WorkShop 6 C++ compiler.

* src/utils/afmtodit/afmtodit.pl: Make script search for files in
the default font directory also.  Based on a patch from James
J. Ramsey <jjramsey_6x9eq42@yahoo.com>.
* src/utils/afmtodit/Makefile.sub (afmtodit): Handle @FONTDIR@.
* src/utils/afmtodit/afmtodit.man: Document it.

* NEWS: Updated.

* tmac/groff_man.man, doc/groff.texinfo: Many minor fixes.

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