Preliminary implementation of Testing Automata.

* configure.ac: Generate src/ta/Makefile and src/taalgos/Makefile.
* src/Makefile.am (SUBDIRS): Add them.
* src/tgbatest/ltl2tgba.cc (main): Add option -TA.
* src/ta/Makefile.am, src/ta/ta.hh, src/ta/taexplicit.cc,
src/ta/taexplicit.hh, src/taalgos/Makefile.am,
src/taalgos/dotty.cc, src/taalgos/dotty.hh,
src/taalgos/reachiter.cc, src/taalgos/reachiter.hh,
src/taalgos/sba2ta.cc, src/taalgos/sba2ta.hh: New files.

src/taalgos/dotty.hh

@@ -0,0 +1,35 @@
+// Copyright (C) 2010 Laboratoire de Recherche et Developpement
+// 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.
+
+#ifndef SPOT_TAALGOS_DOTTY_HH
+# define SPOT_TAALGOS_DOTTY_HH
+
+#include "ta/ta.hh"
+#include <iosfwd>
+
+namespace spot
+{
+  class ta;
+
+  std::ostream&
+  dotty_reachable(std::ostream& os, const ta* a);
+}
+
+#endif // SPOT_TAALGOS_DOTTY_HH