for debian package: build-depend on libdbus-1-dev, don't recommand dbus (python2.4 depends on it), recommand python-gnupginterface instead of suggest it, don't depend on python2.4-pysqlite2 if python2.5 is installed. see #2992

share space in pref window in status tab between default status message expander and preset status message frame when expander is expander. see #2918

See Yann, was possible, even if it's only one bit gain :D

- Stop saving avatars of participants without their resource.
- Complement of [7927], don't save sha before avatar. Really fix #2956
- Don't save sha if avatar not readable.