Rename tgbatest into tests.

* src/Makefile.am, README, configure.ac: update references.
* src/tgbatest/: rename as...
* src/tests/: ...this!

src/tgbatest/randtgba.test

@@ -1,33 +0,0 @@
-#!/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 graph generated by randaut have successors for each
-  # of their $n nodes.
-    ../../bin/randaut -S$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