roster contact context menu now via glade, also has a non working yet menuitem to single message (eg. type=normal and not chat); last but not we now use ImageMenuItem and not hbox + MenuItem to have images where we implement gui on code and not on glade [as we prefer]

we now have option in case abc@doremi.org is not an email and it is jid (we can add it to roster, we can chat to it, we can join group chat). Most of the patch is done by neurocyte

roster now has another cellrenderer (that holds pixbuf) so does the treestore there
result: Gajim now shows an icon for accounts that were connected with ssl, tls and can show avatar of users too [that is TODO]