Revamp the ltl2tgba benchmark.

* bench/ltl2tgba/algorithms: Reduce the number of Spot configuration
tested.
* bench/ltl2tgba/Makefile.am (run, small.txt, big.txt, known.txt):
New rules.
* bench/ltl2tgba/big, bench/ltl2tgba/small, bench/ltl2tgba/known:
Add a 15min timeout to the lbtt configuration.
* bench/ltl2tgba/defs.in: Adjust variable definitions to accept
variable inderections.
* bench/ltl2tgba/parseout.pl: Add an option to output the table in
LaTeX.  Also consider all formulae, not just the positive
formulae.
* bench/ltl2tgba/README: Update.

bench/ltl2tgba/big

@@ -1,5 +1,7 @@
 #!/bin/sh
 # -*- shell-script -*-
+# Copyright (C) 2011 Laboratoire de Recherche et Developpement de
+# l'Epita (LRDE)
 # Copyright (C) 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
 # département Systèmes Répartis Coopératifs (SRC), Université Pierre
 # et Marie Curie.
@@ -38,6 +40,7 @@ GlobalOptions
 #   ComparisonCheck = no
    ConsistencyCheck = no
 #   IntersectionCheck = no
+   TranslatorTimeout = 15min
 }
 
 StateSpaceOptions