Also disable i18n because that seems to be causing many problem to Mac
users building Spot for git and not knowing how to install
Locale::gettext.
* tools/help2man: Update from upstream, plus the two changes from
2b4cf8e7cb and
f7b65001e9.
* bin/man/Makefile.am: Remove the -L flag.
* src/bin/man/autfilt.x, src/bin/man/dstar2tgba.x,
src/bin/man/ltl2tgba.x, src/bin/man/ltlcross.x,
src/bin/man/ltlgrind.x, src/bin/man/randltl.x, src/bin/man/spot-x.x:
Improve typesetting and cross-references.
* tools/help2man: Adjust to better detect the optional arguments.
Detect options that are not separated from their description by two
spaces. Argp output some of those.
* tools/man2html.pl: New file.
* Makefile.am: Distribute it.
* src/bin/ltlfilt.cc: Fix description of --define.
* src/bin/ltlgrind.cc: Fix duplicate description for --help and
--version. Reorder --help output slightly.
* NEWS: Mention the few fixes.
* tools/help2man, tools/x-to-1.in: New files, copied from gnulib
1af55d85d9762a679b4302d5995f05ccd883e956.
* configure.ac: Create x-to-1 and export CROSS_COMPILING.
* Makefile.am: Distribute help2man.
* src/bin/Makefile.am (SUBDIRS): New.
* src/bin/man/Makefile.am: New file.
* src/bin/man/genltl.x, src/bin/man/ltlfilt.x: New files.
* src/bin/genltl.cc: Document the RANGE in the options,
and move the bibliography to genltl.x.
* README: Document src/bin/man
