quick frontend (contact list): better handling of cache with full jid: - get_cache has a new argument "bare_default" - value of resource is returned if full jid is used. None is returned if not found and bare_default is False, bare jid value is returned if not found and bare_default is True

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