jp (blog, common): added --force-item option to avoid magic and use argument as actual item id: - creation of new item with item id has been fixed - --force-item allow to use url as item id, or keyword - pubsub_item can is now returned by getItemPath. If not None, the id is known and must be used

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