* HACKING: Mention that we require Bison >= 2.4 for developers.
* src/evtgbaparse/evtgbaparse.yy, src/tgbaparse/tgbaparse.yy,
src/ltlparse/ltlparse.yy: The sections "%{ ... %}" should now be
renamed "%code requires { ... }" or "%code { ... }" depending on
whether they should end up in the parser's header file or its cc
file.  Also use %language, %locations, %defines, instead of
command-line arguments.
* src/evtgbaparse/Makefile.am, src/tgbaparse/Makefile.am,
src/ltlparse/Makefile.am: Remove the --locations, --defines
and --languages in the call to bison.  Add -Wall -Werror to
catch more errors.
Thanks to Akim Demaille <akim@lrde.epita.fr> for the help.

Here are the reverted patches:
8c0d1003,
25a31142,
9afbaf63,
dc0005f4,
543190f2.

Merge all eltlast/ files into formula.hh (except automatop.hh).

Merge all ltlast/ files into formula.hh.  The forward declaration of visitor was causing error messages too cryptic for users.

2008-06-02  Guillaume SADEGH  <sadegh@lrde.epita.fr>

        * iface/nips/nipstest/Makefile.am, iface/nips/Makefile.am,
        configure.ac, iface/nips/nipstest/emptiness.test,
        iface/nips/nipstest/dotty.test: Test suite for the NipsVM
        front-end.
        * iface/nips/emptiness_check.cc, iface/nips/dottynips.cc:
        `catch'
        don't throw anymore an exception, but exit with 1.
        * iface/nips/common.cc, iface/nips/nips.cc (nips_interface):
        Change messages of nips_exception.

	* iface/gspn/Makefile.am (gspndir): Install in spot/iface/gspn/.
	* iface/nips/Makefile.am (nipsdir): Install in spot/iface/nips/.