Release Spot 2.7

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

NEWS

-New in spot 2.6.3.dev (not yet released)
+New in spot 2.7 (2018-12-11)
 
   Command-line tools:
 
@@ -76,9 +76,10 @@ New in spot 2.6.3.dev (not yet released)
     twa_graph_ptr::is_empty(), twa_graph_ptr::intersects(), and
     scc_info::determine_unknown_acceptance().
 
-  - The new function spot::to_parity() translates an automaton
-    with arbitrary acceptance condition into a parity automaton,
-    based on a last-appearance record (LAR) construction.
+  - The new function spot::to_parity() translates an automaton with
+    arbitrary acceptance condition into a parity automaton, based on a
+    last-appearance record (LAR) construction.  (It is used by ltlsynt
+    but not yet by autfilt or ltl2tgba.)
 
   - The new function is_liveness() and is_liveness_automaton() can be
     used to check whether a formula or an automaton represents a

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], [2.6.3.dev], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.7], [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 2.6.3
-#+MACRO: LASTRELEASE 2.6.3
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.6.3.tar.gz][=spot-2.6.3.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-6-3/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2018-10-17
+#+MACRO: SPOTVERSION 2.7
+#+MACRO: LASTRELEASE 2.7
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.7.tar.gz][=spot-2.7.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-7/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2018-12-11
 
 #+ATTR_HTML: :id spotlogo
 [[file:spot2.svg]]