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.

spot/priv/weight.cc

@@ -0,0 +1,67 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2011, 2014, 2016 Laboratoire de Recherche et
+// Developpement de l'Epita.
+// Copyright (C) 2004  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/>.
+
+#include <cassert>
+#include <ostream>
+#include <spot/priv/weight.hh>
+
+namespace spot
+{
+  weight::weight(const acc_cond& acc):
+    m(acc.num_sets())
+  {
+  }
+
+  weight& weight::add(acc_cond::mark_t a)
+  {
+    for (auto s: a.sets())
+      ++m[s];
+    return *this;
+  }
+
+  weight& weight::sub(acc_cond::mark_t a)
+  {
+    for (auto s: a.sets())
+      if (m[s] > 0)
+	--m[s];
+    return *this;
+  }
+
+  acc_cond::mark_t weight::diff(const acc_cond& acc, const weight& w) const
+  {
+    unsigned max = acc.num_sets();
+    std::vector<unsigned> res;
+    for (unsigned n = 0; n < max; ++n)
+      if (m[n] > w.m[n])
+	res.push_back(n);
+    return acc_cond::mark_t(res.begin(), res.end());
+  }
+
+  std::ostream& operator<<(std::ostream& os, const weight& w)
+  {
+    unsigned s = w.m.size();
+    for (unsigned n = 0; n < s; ++n)
+      os << '(' << n << ',' << w.m[n] << ')';
+    return os;
+  }
+
+};