[client-connection] add an auto-close property for ClientConnection The next commit introduce a connect function that open a new Session and return an associated ClientConnection. The Session should not be used by anything else than the created ClientConnection, so we want to close it at the same time than the ClientConnection. The implementation in this changeset is simplistic. We probably want to move this notion in the session itself. This be improved once we have server side Connection

Add some entities
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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.