Add documentation for temporal logic operators.

* doc/tl/Makefile.am, doc/tl/tl.tex, doc/tl/tl.bib: New files.
* doc/Makefile.am (SUBDIRS): Recurse into tl/.
* configure.ac: Output doc/tl/Makefile
* README: Describe doc/tl/.

doc/tl/Makefile.am

@@ -0,0 +1,33 @@
+## Copyright (C) 2011 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+## Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+
+all: $(srcdir)/tl.pdf
+TEXI2PDF = texi2dvi --pdf
+TEXI2PDF_FLAGS =  --tidy --build-dir=tmp.t2d --batch
+
+dist_pdf_DATA = $(srcdir)/tl.pdf
+
+$(srcdir)/tl.pdf: $(srcdir)/tl.tex $(srcdir)/tl.bib
+	$(TEXI2PDF) $(TEXI2PDF_FLAGS) -o $@ $<
+
+.PHONY: mostlyclean-local
+mostlyclean-local:
+	rm -rf tmp.t2d