quick frontend, primitivus, wix: MUC private messages management /!\ not fully finished, backend part is not done yet /!\ - as resources are discarded to manage chat windows lists, a pretty dirty hack is done to work around this: full jid is escaped using a prefix (it becomes invalid and resource is preserved). - new quick_utils module, with helper methods. escapePrivate and unescapePrivate implementations - MUC private messages are not managed in Wix yet