lbtt: improve the LBTT output

Provide a way to output automata with state-based acceptance.  Also
print the guards using to_lbt_string() for consistency: as a
consequence, atomic proposition that do not match p[0-9]+ are now
double-quoted.

* src/tgbaalgos/lbtt.hh (lbtt_reachable): Add a sba option.
* src/tgbaalgos/lbtt.cc: Implement it, and use to_lbt_string().
* src/ltlvisit/lbt.cc (is_pnum): Reject 'p' without number.
* src/bin/ltl2tgba.cc: Activate the sba option of --ba was given.
Add an option --lbtt=t to get the old behavior.
* src/bin/man/ltl2tgba.x: Document the LBTT format we use with
some links and examples.
* src/tgbatest/lbttparse.test: More tests.
* src/tgbatest/ltlcross2.test: Add a check with --lbtt --ba.
* NEWS: Update.

src/tgbatest/lbttparse.test

@@ -1,6 +1,6 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2012 Laboratoire de Recherche et Développement
+# Copyright (C) 2012, 2013 Laboratoire de Recherche et Développement
 # de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -38,8 +38,29 @@ do
   tr=`cat size | sed -n 's/transitions: //p'`
   l=`expr $st \* 2 + $tr + 1`
   test "$s" -eq "$l"
-done
 
+  # Do the same with bin/ltl2tgba
+  run 0 ../../bin/ltl2tgba --low --any --lbtt "$f" >out3
+  cmp out out3
+  head -n 1 out3 | grep t
+  # Make sure we output the state-based format
+  # for BA...
+  run 0 ../../bin/ltl2tgba --ba --lbtt --low --any "$f" >out4
+  head -n 1 out4 | grep t && exit 1
+  s4=`wc -l < out4`
+  test "$s" -eq "$s4"
+  run 0 ../ltl2tgba -t -XL out4 > out5
+  s5=`wc -l < out5`
+  test "$s" -eq "$s5"
+  # ... unless --lbtt=t is used.
+  run 0 ../../bin/ltl2tgba --ba --lbtt=t --low --any "$f" >out6
+  head -n 1 out6 | grep t
+  s6=`wc -l < out6`
+  test "$s" -eq "$s6"
+  run 0 ../ltl2tgba -t -XL out6 > out7
+  s7=`wc -l < out7`
+  test "$s" -eq "$s7"
+done
 
 # This is the output of 'lbt' on the formula 'U p0 p1'.
 cat >Up0p1 <<EOF

src/tgbatest/ltlcross2.test

@@ -37,4 +37,5 @@ ltl2tgba=../../bin/ltl2tgba
 "$ltl2tgba --lbtt -x comp-susp,!skel-wdba --lbtt --small %f >%T" \
 "$ltl2tgba --lbtt -x comp-susp,early-susp --lbtt --small %f >%T" \
 "$ltl2tgba --lbtt -x comp-susp,!skel-wdba,!skel-simul --lbtt --small %f >%T" \
+"$ltl2tgba --lbtt --ba --high %f > %T" \
 --json=output.json --csv=output.csv