move the sanity tests in tests/sanity/

* spot/sanity/: Move ...
* tests/sanity/: ... here.
* spot/sanity/Makefile.am: Merge with...
* tests/Makefile.am: ... this.
* tests/run.in: Learn to run perl tests.
* README, configure.ac, spot/Makefile.am: Adjust.
* spot/tl/mark.hh: Add missing SPOT_API detected by
fixed private.test.

* spot/twaalgos/weight.cc, spot/twaalgos/weight.hh: Move...
* spot/priv/weight.cc, spot/priv/weight.hh: ... here, as
suggested by fixed private.test.
* spot/twaalgos/tau03opt.cc, spot/twaalgos/Makefile.am,
spot/priv/Makefile.am: Adjust.

tests/sanity/includes.test

@@ -0,0 +1,59 @@
+#! /bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2008, 2011, 2012, 2016 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
+# Copyright (C) 2004, 2005 Laboratoire d'Informatique de Paris 6
+# (LIP6), département Systèmes Répartis Coopératifs (SRC), Université
+# Pierre et Marie Curie.
+#
+# 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/>.
+
+# Check that each header is self contained and generates no warning.
+
+set -e
+
+rm -f failures
+
+
+INCDIR=${srcdir-.}/../../spot
+
+for file in `find "$INCDIR" \( -name "${1-*}.hh" \
+                               -o -name "${1-*}.hxx" \) \
+                  -a -type f -a -print | sed "s,$INCDIR/,,g"`; do
+
+   if head -n 100 "$INCDIR/$file" | grep -q "[	 ]*#.*pragma.* once\$"; then
+     :
+   elif grep -q 'GNU Bison 2\.6' "$INCDIR/$file"; then
+     # Bison 2.6, 2.6.1, 2.6.2 have a bug where position.hh
+     # include <iosfwd> instead of <iostream>.
+     continue
+   elif grep -q 'GNU Bison' "$INCDIR/$file"; then
+     :
+   else
+     echo "Missing, or incorrect include guard." >&2
+     echo "FAIL: $file"
+     echo "  $file" >> failures
+     continue
+   fi
+   echo "PASS: $file"
+done
+
+if test -f failures; then
+   echo "Failed files:"
+   cat failures
+   rm failures
+   exit 1;
+fi