Use the count_state() function instead of stats_reachable().

* src/tgbaalgos/postproc.cc: Move the count_state() function...
* src/priv/countstates.cc, src/priv/countstates.hh: ... in these
new files.
* src/priv/Makefile.am: Add them.
* src/saba/sabacomplementtgba.cc, src/tgba/tgbakvcomplement.cc,
src/tgbaalgos/minimize.cc: Use count_states() instead of
stats_reachable().

src/priv/countstates.cc

@@ -0,0 +1,41 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2013 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/>.
+
+#include "countstates.hh"
+#include "tgba/tgbaexplicit.hh"
+#include "tgbaalgos/stats.hh"
+
+namespace spot
+{
+  unsigned count_states(const tgba* a)
+  {
+    const sba_explicit_number* se =
+      dynamic_cast<const sba_explicit_number*>(a);
+    if (se)
+      return se->num_states();
+    const tgba_explicit_number* te =
+      dynamic_cast<const tgba_explicit_number*>(a);
+    if (te)
+      return te->num_states();
+    tgba_statistics st = stats_reachable(a);
+    return st.states;
+  }
+
+
+}