[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.

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"""pre 3.6 bw compat"""

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# pylint: disable-msg=W0614,W0401

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from warnings import warn

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warn('moved to cubicweb.tags', DeprecationWarning, stacklevel=2)

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from cubicweb.tags import *