rename src/ as spot/ and use include <spot/...>

* NEWS: Mention the change.
* src/: Rename as ...
* spot/: ... this, adjust all headers to include <spot/...> instead of
"...", and adjust all Makefile.am to search headers from the top-level
directory.
* HACKING: Add conventions about #include.
* spot/sanity/style.test: Add a few more grep to catch cases
that do not follow these conventions.
* .gitignore, Makefile.am, README, bench/stutter/Makefile.am,
bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, configure.ac,
debian/rules, doc/Doxyfile.in, doc/Makefile.am,
doc/org/.dir-locals.el.in, doc/org/g++wrap.in, doc/org/init.el.in,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut10.org, doc/org/tut20.org, doc/org/tut21.org,
doc/org/tut22.org, doc/org/tut30.org, iface/ltsmin/Makefile.am,
iface/ltsmin/kripke.test, iface/ltsmin/ltsmin.cc,
iface/ltsmin/ltsmin.hh, iface/ltsmin/modelcheck.cc,
wrap/python/Makefile.am, wrap/python/ajax/spotcgi.in,
wrap/python/spot_impl.i, wrap/python/tests/ltl2tgba.py,
wrap/python/tests/randgen.py, wrap/python/tests/run.in: Adjust.

spot/twaalgos/cleanacc.cc

@@ -0,0 +1,63 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2015 Laboratoire de Recherche et Développement
+// 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/>.
+
+#include <spot/twaalgos/cleanacc.hh>
+
+namespace spot
+{
+  twa_graph_ptr cleanup_acceptance_here(twa_graph_ptr aut)
+  {
+    auto& acc = aut->acc();
+    if (acc.num_sets() == 0)
+      return aut;
+
+    auto& c = aut->get_acceptance();
+    acc_cond::mark_t used_in_cond = c.used_sets();
+
+    acc_cond::mark_t used_in_aut = 0U;
+    for (auto& t: aut->edges())
+      used_in_aut |= t.acc;
+
+    auto useful = used_in_aut & used_in_cond;
+
+    auto useless = acc.comp(useful);
+
+    if (!useless)
+      return aut;
+
+    // Remove useless marks from the automaton
+    for (auto& t: aut->edges())
+      t.acc = t.acc.strip(useless);
+
+    // Remove useless marks from the acceptance condition
+    aut->set_acceptance(useful.count(), c.strip(useless, true));
+
+    // This may in turn cause even more set to be unused, because of
+    // some simplifications, so do it again.
+    return cleanup_acceptance_here(aut);
+  }
+
+  twa_graph_ptr cleanup_acceptance(const_twa_graph_ptr aut)
+  {
+    return cleanup_acceptance_here(make_twa_graph(aut,
+						     twa::prop_set::all()));
+  }
+
+
+}