Offline version of the degeneralization.

* src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh: New files, with
most of the logic extracted from src/tgba/tgbatba.cc (SBA version).
* src/tgbaalgos/Makefile.am: Distribute these.
* src/tgbatest/ltl2tgba.cc: Use the new degeneralization instead of
the on-the-fly version.

src/tgbaalgos/degen.hh

@@ -0,0 +1,44 @@
+// Copyright (C) 2012 Laboratoire de Recherche et
+// Développement de l'Epita.
+//
+// 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.
+
+#ifndef SPOT_TGBAALGOS_DEGEN_HH
+# define SPOT_TGBAALGOS_DEGEN_HH
+
+namespace spot
+{
+  class sba;
+  class tgba;
+
+  /// \brief Degeneralize a spot::tgba into an equivalent sba with
+  /// only one acceptance condition.
+  ///
+  /// This algorithms will build a new explicit automaton that has
+  /// at most (N+1) times the number of states of the original automaton.
+  ///
+  /// If you want to build a degeneralized automaton on-the-fly, see
+  /// spot::tgba_sba_proxy or spot::tgba_tba_proxy.
+  ///
+  /// \see tgba_sba_proxy, tgba_tba_proxy
+  /// \ingroup tgba_misc
+  sba* degeneralize(const tgba* a);
+}
+
+
+#endif