randomize: new function

* src/tgbaalgos/randomize.cc, src/tgbaalgos/randomize.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/graph/graph.hh (rename_states_): New method.
* src/bin/autfilt.cc: Add options --randomize and --seed.
* src/tgbatest/randomize.test: Test them.
* src/tgbatest/Makefile.am: Add randomize.test.
* NEWS: Mention randomize().

src/tgbaalgos/randomize.hh

@@ -0,0 +1,37 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2014 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/>.
+
+#ifndef SPOT_TGBAALGOS_RANDOMIZE_HH
+# define SPOT_TGBAALGOS_RANDOMIZE_HH
+
+#include "tgba/tgbagraph.hh"
+
+namespace spot
+{
+  /// \brief Randomize a TGBA
+  ///
+  /// Make a random permutation of the state, and of the transitions
+  /// leaving this state.
+  SPOT_API void
+  randomize(tgba_digraph_ptr& aut,
+	    bool randomize_states = true,
+	    bool randomize_transitions = true);
+}
+
+#endif // SPOT_TGBAALGOS_RANDOMGRAPH_HH