[entity] move req.create_entity content to a cw_instantiate factory method on entity classes, so cube developpers will be able to easily customize instance creation
""" CW - nevow/twisted client
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""