Delete groffer.

Per discussion on the groff development mailing list, there is
no desire to retain the maintenance of this portion of the groff
distribution.

See <https://lists.gnu.org/archive/html/groff/2020-04/msg00051.html>
et seq.

* contrib/groffer: Recursively delete.

* Makefile.am:
* arch/mingw/mingw.am: Stop building groffer.

* m4/groff.m4 (GROFF_GROFFERDIR_OPTION):
  (GROFF_GROFFERDIR_OPTION): Delete; remove "--with-grofferdir"
  configuration option.

* MANIFEST:
* NEWS:
* PROJECTS:
* TODO:
* contrib/chem/chem.1.man:
* contrib/chem/examples/122/README.txt:
* contrib/chem/examples/README.txt:
* contrib/glilypond/glilypond.1.man:
* contrib/gperl/gperl.1.man:
* contrib/gpinyin/gpinyin.1.man:
* contrib/groff_filenames/groff_filenames.5.man:
* man/groff_font.5.man:
* man/roff.7.man:
* src/roff/groff/groff.1.man:
* src/roff/grog/grog.1.man:
* src/utils/addftinfo/addftinfo.1.man:
* tmac/groff_trace.7.man: Delete references to groffer.

Historical references to groffer deliberately remain in ChangeLog,
ChangeLog.{118,120}, NEWS, contrib/{chem,glilypond}/ChangeLog,
and doc/webpage.ms.  This is a case of deletion, not damnatio memoriae.

Some minor cosmetic changes came along for the ride:

* contrib/groff_filenames/groff_filenames.5.man: Use literal section
  numbers for non-groff man page cross-references; the expansions
  @MAN[157]EXT@ are determined by groff configuration parameters and not
  appropriate for other pages.

* contrib/groff_filenames/groff_filenames.5.man: Refer to Heirloom
  Doctools project as such, not "Heirloom roff", and stop ascribing its
  ownership to Gunnar Ritter; as I understand it, he stopped working on
  it years ago, and it is now maintained by others.

* PROJECTS:
* TODO: Correct asymmetric `quotes' in copyright comments.

* contrib/chem/chem.1.man:
* contrib/gperl/gperl.1.man:
* contrib/gpinyin/gpinyin.1.man Stop preventing hyphenation on words
  that won't get hyphenated; no visible effect on output.

* contrib/gperl/gperl.1.man:
* contrib/groff_filenames/groff_filenames.5.man:
* src/roff/grog/grog.1.man: Fix source style nit in sectioning; no
  visible effect on output.

1 files changed, 0 insertions, 1 deletions

diff --git a/arch/mingw/mingw.am b/arch/mingw/mingw.am
index 855997558..aacca302e 100644
--- a/arch/mingw/mingw.am
+++ b/arch/mingw/mingw.am
@@ -25,7 +25,6 @@ WINSCRIPTS=\
   arch/mingw/gperl.cmd \
   arch/mingw/gpinyin.cmd \
   arch/mingw/grap2graph.cmd \
-  arch/mingw/groffer.cmd \
   arch/mingw/grog.cmd \
   arch/mingw/gropdf.cmd \
   arch/mingw/mmroff.cmd \