Add a remove_fin() algorithm

* src/bin/autfilt.cc: Add remove_fin().
* src/tgba/acc.cc, src/tgba/acc.hh: Add is_dnf() and simplify eval().
* src/tgbaalgos/remfin.cc, src/tgbaalgos/remfin.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbatest/remfin.test: New file.
* src/tgbatest/Makefile.am: Add it.

src/tgbaalgos/remfin.hh

@@ -0,0 +1,32 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2015 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 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_REMFIN_HH
+# define SPOT_TGBAALGOS_REMFIN_HH
+
+#include "tgba/tgbagraph.hh"
+
+namespace spot
+{
+  /// \brief Rewrite an automaton without Fin acceptance.
+  SPOT_API tgba_digraph_ptr
+  remove_fin(const const_tgba_digraph_ptr& aut);
+}
+
+#endif // SPOT_TGBAALGOS_DTGBACOMP_HH