[web] start a new message system based on id of message stored in session's data instead of using __message as today, which is problematic (allow message injection). Also we can have html in messages. Removed the __createdpath hack used to escape those limitation. The old system should still work though (and will probably for a while, though we should progressivly move to the new system where it's possible). Cleanup request paramaters handling on the way.

# postcreate script. You could setup site properties or a workflow here for example
"""

:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""

# Example of site property change
#set_property('ui.site-title', "<sitename>")