[session] Stop relying on _sessions to synchronize living session
by doing what we currently do in pyramid. Also, attempt to synchronize CWUser's
class sounds like a dark corner case handling that should be removed in favor of
short lived user objects (beside it shouldn't occur except during migration).
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*