Use new repoapi for the web stack
The publisher now link repoapi.ClientConnection to request. and explicitly
control there scope.
Web side, appobject._cw.cnx is now a repoapi.ClientConnection.
This actually kill webonly possibility until the repoapi is able to use some
RPC.
The change in the authentication stack is very hasty and need cleanup
Add some entities
-----------------
As manager, you can access to entity creation forms by using the `site management`_ page.
.. _`site management`: manage
As regular user, the index page or the action box may propose some links to create entities according to the context.