Release Spot 2.0

* configure.ac, doc/org/setup.org, NEWS: Update version number.

NEWS

-New in spot 1.99.9a (not yet released)
+New in spot 2.0 (2016-04-11)
 
   Command-line tools:
 
   * ltlfilt now also support the --accept-word=WORD and
-  --reject-word=WORD options that were introduced in autfilt in the
-  previous version.
+    --reject-word=WORD options that were introduced in autfilt in the
+    previous version.
 
   Python:
 
   * The output of spot.atomic_prop_collect() is printable and
-  can now be passed directly to spot.ltsmin.model.kripke().
+    can now be passed directly to spot.ltsmin.model.kripke().
 
   Library:
 
@@ -17,9 +17,11 @@ New in spot 1.99.9a (not yet released)
 
   Documentation:
 
-  * The concepts page (https://spot.lrde.epita.fr/concepts.html)
-  now includes a highlevel description of the architecture, and
-  some notes aboute automata properties.
+  * The concepts page (https://spot.lrde.epita.fr/concepts.html) now
+    includes a highlevel description of the architecture, and some
+    notes aboute automata properties.
+
+  * More Doxygen documentation for spot::formula and spot::digraph.
 
 New in spot 1.99.9 (2016-03-14)
 

configure.ac

@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [1.99.9a], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.0], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnu tar-ustar color-tests parallel-tests])

doc/org/setup.org

 #+OPTIONS: H:2 num:nil toc:t html-postamble:nil
 #+EMAIL: spot@lrde.epita.fr
 #+HTML_LINK_HOME: index.html
-#+MACRO: SPOTVERSION 1.99.9
-#+MACRO: LASTRELEASE 1.99.9
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-1.99.9.tar.gz][=spot-1.99.9.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-1-99-9/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2016-03-14
+#+MACRO: SPOTVERSION 2.0
+#+MACRO: LASTRELEASE 2.0
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.0.tar.gz][=spot-2.0.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-0/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2016-04-11