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/sepsets.test

@@ -1,66 +0,0 @@
-#!/bin/sh
-# -*- coding: utf-8 -*-
-# Copyright (C) 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/>.
-
-. ./defs
-
-cat >in <<EOF
-HOA: v1
-States: 3
-Start: 2
-AP: 3 "a" "b" "c"
-acc-name: Buchi
-Acceptance: 2 Fin(0)&Inf(1) | Fin(1)&Inf(0)
---BODY--
-State: 0
-[0] 0 {1}
-[!0] 0 {0}
-State: 1
-[2] 0 {0}
-[1&!2] 1 {1}
-State: 2
-[2] 0
-[!0&1&!2] 1
-[0&!2] 2 {0 1}
---END--
-EOF
-
-cat >expected <<EOF
-HOA: v1
-States: 3
-Start: 2
-AP: 3 "a" "b" "c"
-Acceptance: 4 (Fin(2) & Inf(1)) | (Fin(3) & Inf(0))
-properties: trans-labels explicit-labels trans-acc deterministic
---BODY--
-State: 0
-[0] 0 {1 3}
-[!0] 0 {0 2}
-State: 1
-[2] 0 {0 2}
-[1&!2] 1 {1 3}
-State: 2
-[2] 0
-[!0&1&!2] 1
-[0&!2] 2 {0 1 2 3}
---END--
-EOF
-
-run 0 ../../bin/autfilt --separate-sets in -H > out
-diff out expected