* fixed some problems with SQL escapement for roster versioning. For example when we have double quote or another character like this. Fixes #5159
* some code refactoring for roster versioning in common/logger.py
* added a docstring and some comments in common/logger.py

restore metacontct correctly when we connect to server and we already have contacts in roster (stored locally). Fixes #5156

handle correctly when MUC server force us to change our nickname by sending a 303 error presence. Fixes #5055

* fixed a bug when we remove a contact from our contact list (before we did not remove contact from roster_group table)

* now there is no more sparkling when we update the RosterWindow with the roster received from the server (when server does not handle roster versioning or when it resends the whole roster)

* In order to allow the viewing of the roster when we are offline (and some other cool stuffs), with and without roster versioning, now we load roster when RosterWindow is created (at gajim startup). Fixes #3190

* in order to permit roster loading at gajim startup we need to save all roster pushs (even if it's not for versioning)

Fixed bug when national character (non-ASCII) was entered which search string in ACE (comparison with descriptions, which are unicode, was not possible). It seems that this was Win32 specific (tested on Vista64).

* fixed a bug (when a contact does not have a name)

* now we load roster from DB when we receive an iq result for the roster without any query
* added a "force" argument to NonBlockingRoster.getRoster(), to force the return of the instance

[Spike411] Facebook iconset for Gajim. A great thanks to Jakub Szypulka for is iconset: http://cubestuff.wordpress.com/2008/05/21/facebook-goes-tango/