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/isweakscc.hh

@@ -0,0 +1,70 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2012, 2013, 2014 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/>.
+
+#pragma once
+
+#include <spot/twaalgos/sccinfo.hh>
+
+namespace spot
+{
+  /// \addtogroup twa_misc
+  /// @{
+
+  /// \brief Whether the SCC number \a scc in \a map is inherently
+  /// weak.
+  ///
+  /// An SCC is inherently weak if either its cycles are all
+  /// accepting, or they are all non-accepting.
+  ///
+  /// Note the terminal SCCs are also inherently weak with that
+  /// definition.
+  ///
+  /// The absence of accepting cycle is easy to check (the scc_info
+  /// object can tell whether the SCC is non-accepting already).
+  /// Similarly, an SCC in which all transitions belong to all
+  /// acceptance sets is necessarily weak.  For other accepting SCCs,
+  /// this function enumerates all cycles in the given SCC (it stops
+  /// if it find a non-accepting cycle).
+  SPOT_API bool
+  is_inherently_weak_scc(scc_info& map, unsigned scc);
+
+  /// \brief Whether the SCC number \a scc in \a map is weak.
+  ///
+  /// An SCC is weak if its non-accepting, or if all its transition
+  /// are fully accepting (i.e., the belong to all acceptance sets).
+  ///
+  /// Note that terminal SCCs are also weak with that definition.
+  SPOT_API bool
+  is_weak_scc(scc_info& map, unsigned scc);
+
+  /// \brief Whether the SCC number \a scc in \a map is complete.
+  ///
+  /// An SCC is complete iff for all states and all label there exists
+  /// a transition that stays into this SCC.
+  SPOT_API bool
+  is_complete_scc(scc_info& map, unsigned scc);
+
+  /// \brief Whether the SCC number \a scc in \a map is terminal.
+  ///
+  /// An SCC is terminal if it is weak, complete, and accepting.
+  SPOT_API bool
+  is_terminal_scc(scc_info& map, unsigned scc);
+
+  /// @}
+}