quick_frontend (constants, quick_app, quick_contact_list): blogging refactoring (not finished): - adaptation to backend modifications - moved common blogging parts from Libervia to quick frontend - QuickApp use a MB_HANDLE class variable to indicated if blogging is managed by the frontend (and avoid waste of resources if not) - comments are now managed inside parent entry, as a result a tree of comments is now possible - Entry.level indicate where in the tree we are (-1 mean parent QuickBlog, 0 mean main item, more means comment) - items + comments are requested in 1 shot, and RTDeferred are used to avoid blocking while waiting for them - in QuickBlog, id2entries allow to get Entry from it's item id, and node2entries allow to get Entry(ies) hosting a comments node - QuickBlog.new_message_target tell where a new message will be sent by default

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