plugin XEP-0045, quick frontend (app,chat): various chat improvments: - (XEP-0045): join defered is now fired when room is full joined and history is available - (XEP-0045): mucJOIN signature has changed, it now returns the same arguments as mucRoomJoined and a boolean which is True if the room was alread joined - quick frontend (app, chat): adapted code to new changes

Use this module to temporary store files that need to be integrated to other
projects such as Wokkel.

For example, the changeset that introduced this folder adds RSM (XEP-0059)
support to Wokkel. The files in sat.tmp.wokkel are imported over the initial
wokkel files from sat.plugins.__init__.py