mc: rework and test conversion into twa

* spot/mc/Makefile.am,
spot/mc/reachability.hh,
spot/mc/utils.hh,
tests/Makefile.am,
tests/ltsmin/.gitignore,
tests/ltsmin/testconvert.cc,
tests/ltsmin/testconvert.test: Here.

tests/ltsmin/testconvert.test

@@ -0,0 +1,54 @@
+ #! /bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2020 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 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/>.
+
+
+
+. ./defs
+
+divine compile > output 2>&1
+
+if grep -i 'ltsmin ' output; then
+  :
+else
+  echo "divine not installed, or no ltsmin interface"
+  exit 77
+fi
+
+set -e
+
+run 0 ../testconvert $srcdir/finite.dve 'true' > output
+cat << EOF > expected
+[CUBE] Model: 15,24
+[BDD]  Model: 15,24
+[CUBE] Product: not_empty,4,4
+[BDD]  Product: not_empty,15,24
+EOF
+
+cmp output expected
+
+run 0 ../testconvert $srcdir/finite.dve 'G "P.a==5"' > output
+cat << EOF > expected
+[CUBE] Model: 15,24
+[BDD]  Model: 15,24
+[CUBE] Product: empty,1,0
+[BDD]  Product: empty,1,0
+EOF
+
+cmp output expected