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/ltlcounter.test

@@ -0,0 +1,60 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2009, 2010, 2011, 2012, 2014 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/>.
+
+
+. ./defs
+
+set -e
+
+pwd
+lc="genltl"
+
+run='run 0'
+
+check_formula()
+{
+  # First, check the satisfiability of the formula with Spot
+  $run ../ikwiad -CR -e -x -f "$1" >/dev/null
+  # Also check the satisfiability of the degeneralized formula
+  $run ../ikwiad -CR -e -DT -x -f "$1" >/dev/null
+  $run ../ikwiad -CR -e -DS -x -f "$1" >/dev/null
+}
+
+# Kristin Y. Rozier reported that the formulae with n=10 were badly
+# translated.  Each of these formulae should have exactly one
+# accepting path, but in this case the emptiness returned an automata
+# without cycle.  It turned out the function used to compare LTL
+# formulae was bugged when two LTL formulae had the same hash value,
+# so the translation of the formula stopped midway, on a formula it
+# thought it had already seen.
+
+check_range()
+{
+  "$lc" --rv-counter $1 --rv-counter-linear $1 \
+        --rv-counter-carry $1 --rv-counter-carry-linear $1 |
+  while read line; do
+    check_formula "$line"
+  done
+}
+
+check_range 1..2
+# Do not run the larger formulae with valgrind, it is too slow
+run=
+check_range 3..11