rename iface/ as spot-if/

So that instead of having to do
  #incluce <spot/iface/ltsmin/ltsmin.hh>
for using installed the installed header, and
  #incluce <iface/ltsmin/ltsmin.hh>
for using the non-installed version, we now do
  #incluce <spot-if/ltsmin/ltsmin.hh>
in both cases.

* iface/: Rename as...
* spot-if/: ... this.
* doc/Doxyfile.in, README, configure.ac, Makefile.am,
spot/sanity/80columns.test, spot/sanity/style.test: Adjust.
* NEWS: Mention the change.
* spot-if/ltsmin/Makefile.am: Install headers in $includedir/spot-if.
* debian/libspot-dev.install: Distribute that directory as well.

spot-if/ltsmin/Makefile.am

@@ -0,0 +1,52 @@
+## -*- coding: utf-8 -*-
+## Copyright (C) 2011, 2013, 2014, 2015 Laboratoire de Recherche et
+## Developpement 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) \
+              $(BUDDY_CPPFLAGS) -I$(top_srcdir)/ltdl
+AM_CXXFLAGS = $(WARNING_CXXFLAGS)
+
+ltsmindir = $(includedir)/spot-if/ltsmin
+
+ltsmin_HEADERS = ltsmin.hh
+
+lib_LTLIBRARIES = libspotltsmin.la
+libspotltsmin_la_LIBADD = \
+  $(top_builddir)/spot/libspot.la \
+  $(top_builddir)/ltdl/libltdlc.la -lpthread
+libspotltsmin_la_LDFLAGS = -no-undefined $(SYMBOLIC_LDFLAGS)
+libspotltsmin_la_SOURCES = ltsmin.cc
+
+noinst_PROGRAMS = modelcheck
+
+modelcheck_SOURCES = modelcheck.cc
+modelcheck_LDADD = libspotltsmin.la
+
+check_SCRIPTS = defs
+
+TESTS = check.test finite.test finite2.test kripke.test
+EXTRA_DIST = $(TESTS) beem-peterson.4.dve finite.dve finite.pm
+
+kripke.test: $(top_builddir)/spot/tests/parse_print$(EXEEXT)
+
+$(top_builddir)/spot/tests/parse_print$(EXEEXT):
+	cd $(top_builddir)/spot/tests && \
+	$(MAKE) $(AM_MAKEFLAGS) parse_print$(EXEEXT)
+
+distclean-local:
+	rm -rf $(TESTS:.test=.dir)