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/tl/Makefile.am

@@ -0,0 +1,66 @@
+## -*- coding: utf-8 -*-
+## Copyright (C) 2015 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/>.
+
+AM_CPPFLAGS = -I$(top_builddir) -I$(top_srcdir) $(BUDDY_CPPFLAGS)
+AM_CXXFLAGS = $(WARNING_CXXFLAGS)
+
+tldir = $(pkgincludedir)/tl
+
+tl_HEADERS =					\
+  apcollect.hh					\
+  contain.hh					\
+  declenv.hh					\
+  defaultenv.hh					\
+  dot.hh					\
+  environment.hh				\
+  exclusive.hh					\
+  formula.hh					\
+  length.hh					\
+  mutation.hh					\
+  nenoform.hh					\
+  parse.hh					\
+  print.hh					\
+  randomltl.hh					\
+  relabel.hh					\
+  remove_x.hh					\
+  simplify.hh					\
+  snf.hh					\
+  unabbrev.hh
+
+noinst_LTLIBRARIES = libtl.la
+libtl_la_SOURCES =				\
+  apcollect.cc					\
+  contain.cc					\
+  declenv.cc					\
+  defaultenv.cc					\
+  dot.cc					\
+  exclusive.cc					\
+  formula.cc					\
+  length.cc					\
+  mark.cc					\
+  mark.hh					\
+  mutation.cc					\
+  nenoform.cc					\
+  print.cc					\
+  randomltl.cc					\
+  relabel.cc					\
+  remove_x.cc					\
+  simplify.cc					\
+  snf.cc					\
+  unabbrev.cc