Added hack to make BoboPOS2.PersistentMapping look like PersistentMapping

fallback to cgi_module_publisher.

existing Products folder wont be found via acquisition

        constructor.

      - MultiMapping objects implement the has_key and get methods as
        defined for Python 1.5 dictionaries.

new copyright.

        methods of data-less C mix-in classes, C-based __call_method__
        hooks were broken.  The most notable example of this was the
        breaking of the Synchronized class.

      - Calling C-base-class special methods from overriding methods,
        as in::

          class LowerMultiMapping(MultiMapping):

	    def __getitem__(self, key):
	      return MultiMapping.__getitem__(self, lower(key))

        caused infinite loops.

Added new copyright.

calls on wrapped mapping objects to fail.