ltlcross: adjust to work with generic acceptance

* src/bin/ltlcross.cc: Remove Fin-acceptance before
doing checks.  More --verbose output.
* src/tgba/acc.cc, src/tgba/acc.hh: Add an eval_sets() function
to find the set of acceptance sets needed to satisfy the condition
in an accepting SCC.
* src/tgbaalgos/gtec/ce.cc: Use eval_sets() when computing
a counter example.
* src/tgbaalgos/gtec/gtec.cc: Raise an exception when called
on an acceptance that contains Fin.
* src/tgbatest/ltl2dstar3.test, src/tgbatest/ltlcrossce2.test:
New files.
* src/tgbatest/Makefile.am: Add them.
* src/tgba/tgba.cc (is_empty): Call remove_fin if needed.
* src/tgbaalgos/product.cc, src/tgbaalgos/dtgbacomp.cc: Adjust
to work with generic acceptance.

src/tgbatest/ltl2dstar3.test

@@ -0,0 +1,48 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2015 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test ltl2dstar's HOA output with ltlcross.
+
+. ./defs
+set -e
+
+# Skip this test if ltl2dstar is not installed.
+(ltl2dstar --version) || exit 77
+
+ltlfilt=../../bin/ltlfilt
+ltl2tgba=../../bin/ltl2tgba
+ltlcross=../../bin/ltlcross
+randltl=../../bin/randltl
+ltlfilt=../../bin/ltlfilt
+dstar2tgba=../../bin/dstar2tgba
+
+RAB='--automata=rabin --output-format=hoa'
+STR='--automata=streett --output-format=hoa'
+
+# Run ltlcross without product, because this requires too much memory.
+$randltl -n 25 a b | $ltlfilt --remove-wm |
+$ltlcross -F- -f 'GFa & GFb & GFc' -f '(GFa -> GFb) & (GFc -> GFd)' \
+--timeout=30 --verbose --csv=out.csv --products=0 \
+"$ltl2tgba -s %f >%N" \
+"ltl2dstar $RAB --ltl2nba=spin:$ltl2tgba@-s %L %H" \
+"ltl2dstar $STR --ltl2nba=spin:$ltl2tgba@-s %L %H"
+
+grep '"in_type"' out.csv && exit 1
+exit 0