if the resource is empty do not add an extra / [we do not known the resource if we are lower than mod in a muc and we ask version info

we need to have messages in a queue before we do new_chat() in order not to have message printed twice

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]