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.

Added __bobo_debug_mode__ special module variable. When set it shows tracebacks,and tells you why it can't publish an object (i.e. not found, no doc string, unauthorized--no headers, or bad username/password, or starts with an underscore). Also special variables can be set through the environment BOBO_DEBUG_MODE, BOBO_HIDE_TRACEBACKS, BOBO_REALM. Note: __bobo_debug_mode__ overrides __bobo_hide_tracebacks__ which is now deprecated.