plugin groupblog, tmp (mam, rsm): some style improvments/fixes: - renamed variables nammed after reserved word/module - removed class variables which are not needed - removed external parenthesis from asserts - in mam.MAMPrefs, removed default value for default argument, as None can't be used - (groupblog) extended docstring for DeferredItems and DeferredItemsFromMany

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