Release Spot 2.3

* configure.ac, doc/org/setup.org, NEWS: Bump version to 2.3.

NEWS

-New in spot 2.2.2.dev (Not yet released)
+New in spot 2.3 (2017-01-19)
 
   Build:
 

configure.ac

 # -*- coding: utf-8 -*-
-# Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
-# Laboratoire de Recherche et Développement de l'Epita (LRDE).
+# Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
+# 2017 Laboratoire de Recherche et Développement de l'Epita (LRDE).
 # Copyright (C) 2003, 2004, 2005, 2006, 2007 Laboratoire
 # d'Informatique de Paris 6 (LIP6), département Systèmes Répartis
 # Coopératifs (SRC), Université Pierre et Marie Curie.
@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [2.2.2.dev], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.3], [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 2.2.2
-#+MACRO: LASTRELEASE 2.2.2
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.2.2.tar.gz][=spot-2.2.2.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-2-2/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2016-12-16
+#+MACRO: SPOTVERSION 2.3
+#+MACRO: LASTRELEASE 2.3
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.3.tar.gz][=spot-2.3.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-3/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2017-01-19