Adding ltlgrind as a command-line tool

* src/bin/ltlgrind.cc: New file, command-line tool to get mutations of a
formula.
* src/bin/Makefile.am: Add it.
* src/ltlvisit/mutation.hh, src/ltlvisit/mutation.cc:
New files providing the get_mutations function.
* src/ltlvisit/Makefile.am: Add it.
* src/ltltest/ltlgrind.test: Test it.
* src/ltltest/Makefile.am: Add it.
* src/bin/man/ltlgrind.x: Document it.
* src/bin/man/Makefile.am: Add it.
* doc/org/ltlgrind.org: Document it.
* doc/org/tools.org: Add link to ltlgrind documentation page.

src/ltlvisit/mutation.hh

@@ -0,0 +1,52 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2009, 2010, 2012, 2013, 2014 Laboratoire de Recherche et
+// Développement de l'Epita (LRDE).
+// Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
+// département Systèmes Répartis Coopératifs (SRC), Université Pierre
+// et Marie Curie.
+//
+// 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_LTLVISIT_MUTATION_HH
+# define SPOT_LTLVISIT_MUTATION_HH
+
+#include "ltlast/formula.hh"
+#include <limits>
+#include <set>
+#include <vector>
+
+#define MUT_AP2CONST 0x1
+#define MUT_SIMPLIFY_BOUNDS 0x2
+#define MUT_REMOVE_MULTOP_OPERANDS 0x4
+#define MUT_REMOVE_OPS 0x8
+#define MUT_SPLIT_OPS 0x10
+#define MUT_REWRITE_OPS 0x20
+#define MUT_REMOVE_ONE_AP 0x40
+
+namespace spot
+{
+  namespace ltl
+  {
+    typedef std::vector<const formula*> vec;
+    SPOT_API
+    vec get_mutations(const formula*,
+		      unsigned opts = 0xfff,
+		      bool sort = true,
+		      int n = std::numeric_limits<int>::max(),
+		      unsigned m = 1);
+  }
+}
+#endif