implementation of rational operators in a future version.

* src/ltlparse/ltlscan.ll: Do not recognize "*".
* wrap/python/cgi-bin/ltl2tgba.in: Undocument it.
* NEWS: Mention this.
* src/tgbatest/kv.test, src/tgbatest/ltl2tgba.test,
src/tgbatest/reductgba.test: Replace "*" by "&".

* src/tgbatest/ltl2tgba.cc (syntax, main): Do it.
* NEWS: Mention it.

* src/tgbatest/ltl2tgba.cc (syntax, main): Introduce -le to select
this algorithm and -lo to add the default LTL operators.  This
replace the undocumented hack to add LTL operators when the
formula with read for command-line, or the automaton was output
for LBTT.
* src/tgbatest/eltl2tgba.test, src/tgbatest/spotlbtt.test: Update
call syntax.
* NEWS: Mention -le, -lo, and -taa.

* NEWS: Update for upcoming 0.5.
* HACKING: Update Automake requirement.
* README: Mention the mailing list.
* bench/ltlcounter/README: More text.
* configure.ac: Report bugs to spot@lrde.epita.fr.

* HACKING, INSTALL, doc/Doxyfile.in, lbtt/INSTALL: Update to newer
tools.

* HACKING: Update tools requirements.
* src/sanity/Makefile.am (EXTRA_DIST): Distribute includes.test.

* NEWS: Update.

documentation for iface/.
* dox/mainpage.dox: Fix reference to ltl_to_tgba.
* src/ltlenv/environment.hh: Typo.

* doc/Makefile.am ($(srcdir)/spotref.pdf): Do not assume spot.latex is
in the srcdir.

* wrap/python/cgi/Makefile.am (CLEANFILES): Clean ltl2tgba.py.

* iface/gspn/simple.test, iface/gspn/dcswave.test,
iface/gspn/dcswaveltl.test: Make sure the example directory
is writable.
* m4/lbtt.m4, m4/buddy.m4: Always configure buddy/ and lbtt/,
regardless of the --with-included-buddy and --with-included-lbtt
settings.

* NEWS, README: New files.