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.

src/twa/Makefile.am

@@ -1,50 +0,0 @@
-## -*- coding: utf-8 -*-
-## Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Laboratoire
-## de Recherche et Développement 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/>.
-
-AM_CPPFLAGS = -I$(srcdir)/.. -I.. $(BUDDY_CPPFLAGS)
-AM_CXXFLAGS = $(WARNING_CXXFLAGS)
-
-twadir = $(pkgincludedir)/twa
-
-twa_HEADERS = \
-  acc.hh \
-  bdddict.hh \
-  bddprint.hh \
-  formula2bdd.hh \
-  fwd.hh \
-  taatgba.hh \
-  twa.hh \
-  twagraph.hh \
-  twaproduct.hh \
-  twasafracomplement.hh
-
-noinst_LTLIBRARIES = libtwa.la
-libtwa_la_SOURCES = \
-  acc.cc \
-  bdddict.cc \
-  bddprint.cc \
-  formula2bdd.cc \
-  taatgba.cc \
-  twa.cc \
-  twagraph.cc \
-  twaproduct.cc \
-  twasafracomplement.cc