Fix a nondeterministic behavior of the degeneralization algorithm.

Reported by Tomáš Babiak <xbabiak@fi.muni.cz>.

* src/tgba/tgbatba.cc (tgba_tba_proxy): Replace the std::map used
to record outgoing transitions by an Sgi::hash_map, and keep the
order of these transitions in a separate list.
* src/tgbatest/degendet.test: New file.
* src/tgbatest/Makefile.am (TESTS): Add it.
* THANKS: Add Tomáš and convert to utf8.

src/tgbatest/degendet.test

@@ -0,0 +1,39 @@
+#!/bin/sh
+# Copyright (C) 2011 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+
+. ./defs
+
+set -e
+
+# The following command, reported by Tomáš Babiak, used to output many
+# different automata, because state addresses were used to order the
+# successors in the degeneralization.
+
+# Make sure all these runs output the same automaton.
+
+# With valgrind
+run 0 ../ltl2tgba -r7 -x -R3 -N "XF(Gp2 | F(p0 U (p1 & (! p4 | p3))))" > out1
+# Without valgrind
+for i in 2 3 4 5; do
+  ../ltl2tgba -r7 -x -R3 -N "XF(Gp2 | F(p0 U (p1 & (! p4 | p3))))" > out
+  cmp out out1 || exit 1
+done