Log Message:
Update to 2.22.0:

No changes in 2.22.0 except translations.

==============
Version 2.21.0 - "Windmills and Wheatfields"
==============

 * gtk+ minimum version is now 2.8 (Jaap Haitsma)
 * Show correct name in about dialogue (Jaap Haitsma)
 * Fix the infamous socket-finding bug in various ways
   (Loïc Minier, Craig Keogh)
 * Add information for bug-buddy (Matthias Clasen)
 * Remove inappropriate line from help (Thomas Thurman)
 * Session persistence under D-Bus (Alex Jones)
 * Careful checking to make sure all code from branches
   is actually in trunk now.
 * Translators:
Khaled Hosny (ar)
Petr Kovar (cs)
Ignacio Casal Quinteiro (gl)
Kjartan Maraas (nb)
Eskild Hustvedt (nn)
Yannig Marchegay (Kokoyaya) (oc)
Danishka Navin (si)
Pavol Å imo (sk)