Release Spot 2.1.1

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

NEWS

-New in spot 2.1.0a (not yet released)
+New in spot 2.1.1 (2016-09-20)
 
   Command-line tools:
 
   * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
     (%s), Boolean size (%b), and number of atomic propositions (%a)
-    with the --format and --output options.  A typical use is to sort
-    formulas by size:
+    with the --format and --output options.  A typical use-case is to
+    sort formulas by size:
        genltl --dac --format='%s,%f' | sort -n | cut -d, -f2
     or to group formulas by number of atomic propositions:
        genltl --dac --output='ap-%a.ltl'

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], [2.1.0a], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.1.1], [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 2.1
-#+MACRO: LASTRELEASE 2.1
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.1.tar.gz][=spot-2.1.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-1/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2016-08-08
+#+MACRO: SPOTVERSION 2.1.1
+#+MACRO: LASTRELEASE 2.1.1
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.1.1.tar.gz][=spot-2.1.1.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-1-1/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2016-09-20