Merge the core and python tests in the tests/ directory

* tests/: Rename as...
* tests/core/: ... this.
* python/tests/: Rename as...
* tests/python/: ... this.
* python/tests/run.in: Move as...
* tests/run.in: This, and adjust.
* tests/Makefile.am: Adjust to run both core and python tests.
* configure.ac, README, debian/python3-spot.examples, debian/rules,
doc/org/tut.org, python/Makefile.am, spot/ltsmin/Makefile.am,
spot/ltsmin/kripke.test, spot/sanity/ipynb.test: Adjust.

tests/core/unabbrevwm.test

@@ -0,0 +1,49 @@
+#! /bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2012, 2015 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/>.
+
+
+# Check for the unabbreviate_logic visitor
+
+. ./defs || exit 1
+
+set -e
+
+ltlfilt=ltlfilt
+
+# Removing W,M in this formula caused a segfault at some point.
+run 0 $ltlfilt --remove-wm >out <<EOF
+(!((G(p0)) U ((F(p0)) M ((F(X(p1))) & ((p2) W (G(p2))))))) M (F(p0))
+(Fp0 U(Fp0&!(Gp0 U((FXp1 &(Gp2 R(p2|Gp2))) U(Fp0&FXp1&(Gp2 R(p2|Gp2)))))))
+EOF
+
+# The first formula will be simplified to the second, so after uniq
+# the output should have one line.
+test `uniq out | wc -l` = 1
+
+for i in 'GFa' 'a R b' 'a W b' 'a M b'; do
+    for fg in '' F G GF; do
+	for rwm in '' R W M RW RM WM RWM; do
+	    $ltlfilt -f "$i" --unabbrev=$fg$rwm --equivalent-to "$i" >out
+	    test -n "$rwm" && grep "[$rwm]" out && exit 1
+	done
+    done
+done
+
+true