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/randtgba.test

@@ -0,0 +1,33 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2010, 2014, 2015 Laboratoire de Recherche et Development 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
+
+for n in 10 20 30 40 50 60 70 80 90 100 200 500 1000; do
+  # Make sure graphs generated by randaut have successors for each
+  # of their $n nodes.
+    randaut -Q$n 3 -Hl |
+	sed 's/.*--BODY--//;s/State:/\n&/g;s/--END--//' > out
+    grep -q 'State: [0-9][0-9]* .*$' out
+    grep -q 'State: [0-9]* *$' out && exit 1
+done
+true