TaintedString in Shared has never been released as Yvo pointed out to me, so there's no need for deprecation

the 'extra' argument of the publish method is no longer supported
(I hope nobody did use it - let's see if someone complains about this BBB foul)

Removed deprecated support for specifying ``__ac_permissions__``, ``meta_types`` and ``methods`` in a product's ``__init__``.

Get rid of some more testing dependencies in AccessControl by moving integration tests into higher level packages