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/dot.hh

@@ -0,0 +1,47 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2011, 2012, 2013, 2014, 2015 Laboratoire de Recherche
+// et Developpement de l'Epita (LRDE).
+// Copyright (C) 2003, 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/>.
+
+#pragma once
+
+#include <iosfwd>
+#include <spot/twa/fwd.hh>
+#include <spot/misc/common.hh>
+
+namespace spot
+{
+  /// \ingroup twa_io
+  /// \brief Print reachable states in dot format.
+  ///
+  /// If \a assume_sba is set, this assumes that the automaton
+  /// is an SBA and use double elipse to mark accepting states.
+  ///
+  /// \param options an optional string of letters, each indicating a
+  /// different option.  Presently the following options are
+  /// supported: 'v' for vertical output, 'h' for horizontal output,
+  /// 't' force transition-based acceptance, 'N' hide the name of the
+  /// automaton, 'n' shows the name, 'c' uses circle-shaped states,
+  /// 'a' shows the acceptance.
+  SPOT_API std::ostream&
+  print_dot(std::ostream& os,
+		  const const_twa_ptr& g,
+		  const char* options = nullptr);
+}