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/scc.test

@@ -0,0 +1,35 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2009, 2015 Laboratoire de Recherche et Developpement de
+# l'Epita
+#
+# 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
+
+set -e
+
+cat >formulas<<EOF
+((a U c) U b) & (b U c),15,6,5
+b U a,3,2,2
+0,0,1,1
+(Gb | F!a) W GFc,22,6,5
+(!a & G(Ga | F(!a & b))) | (a & F(F!a & G(a | !b))),16,7,6
+EOF
+
+run 0 ltl2tgba --low --any --stats='%f,%e,%s,%c' -F formulas/1 >out
+cat out
+diff out formulas