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/ltlcrossce2.test

@@ -1,72 +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
-set -e
-
-ltl2tgba=../../bin/ltl2tgba
-
-cat >fake <<\EOF
-#!/bin/sh
-case $1 in
-"U G e p0 F p1 p2")
-
-# echo 'U G e p0 F p1 p2' | ltl2dstar --output-format=hoa - - | fmt
-cat <<\END
-HOA: v1 States: 14 properties: implicit-labels trans-labels
-no-univ-branch deterministic complete acc-name: Rabin 3 Acceptance: 6
-(Fin(0)&Inf(1))|(Fin(2)&Inf(3))|(Fin(4)&Inf(5)) Start: 10 AP: 3 "p0"
-"p1" "p2" --BODY-- State: 0 {5} 0 3 5 5 0 3 5 5 State: 1 {3 4} 0 12 5
-1 0 12 5 1 State: 2 {3 4} 2 13 5 5 2 13 5 5 State: 3 {3 4} 13 13 5 5 13
-13 5 5 State: 4 {1 2 4} 4 4 4 4 4 4 4 4 State: 5 {0 2 4} 5 5 5 5 5 5 5
-5 State: 6 {2 4} 8 6 5 1 8 6 5 1 State: 7 {2 4} 7 8 5 5 2 8 5 5 State:
-8 {2 4} 8 8 5 5 8 8 5 5 State: 9 {2 4} 7 11 5 9 2 6 5 1 State: 10 {2 4}
-7 11 5 9 4 4 4 4 State: 11 {2 4} 8 11 5 9 8 6 5 1 State: 12 {4} 13 12
-5 1 13 12 5 1 State: 13 {4} 13 13 5 5 13 13 5 5 --END--
-END
-;;
-"! U G e p0 F p1 p2")
-# echo '! U G e p0 F p1 p2' | ltl2dstar --output-format=hoa - - | fmt |
-# sed '$s:8 13:13 8 /*<-bug*/:';
-cat <<\END
-HOA: v1 States: 14 properties: implicit-labels trans-labels
-no-univ-branch deterministic complete acc-name: Rabin 3 Acceptance: 6
-(Fin(0)&Inf(1))|(Fin(2)&Inf(3))|(Fin(4)&Inf(5)) Start: 11 AP: 3 "p0" "p1"
-"p2" --BODY-- State: 0 {5} 4 0 8 8 4 0 8 8 State: 1 {3 4} 1 1 8 8 1 1 8
-8 State: 2 {3 4} 1 2 8 13 1 2 8 13 State: 3 {3 4} 5 3 8 8 4 0 8 8 State:
-4 {1 2 4} 1 1 8 8 1 1 8 8 State: 5 {1 2 4} 5 3 8 8 1 1 8 8 State: 6 {1
-2 4} 6 3 8 8 12 1 8 8 State: 7 {1 2 4} 5 7 8 9 1 2 8 13 State: 8 {1 2 4}
-8 8 8 8 8 8 8 8 State: 9 {1 2 4} 6 7 8 9 12 2 8 13 State: 10 {0 2 4} 10
-10 10 10 10 10 10 10 State: 11 {2 4} 6 7 8 9 10 10 10 10 State: 12 {2 4}
-12 1 8 8 12 1 8 8 State: 13 {2 4} 12 2 13 8 /*<-bug*/ 12 2 8 13 --END--
-END
-;;
-esac
-EOF
-chmod +x fake
-
-run 1 ../../bin/ltlcross -f 'G(a <-> Fb) U c' \
-  "$ltl2tgba --lbtt %f >%T" "./fake %l >%T" 2> errors
-cat errors
-grep 'error: P0\*N1 is nonempty' errors
-grep 'error: P1\*N1 is nonempty' errors
-grep 'error: Comp..1.\*Comp..1. is nonempty' errors
-test `grep cycle errors | wc -l` = 3
-test `grep '^error:' errors | wc -l` = 4