Modified Files:

        Utility.py -- added a CollectionNS class that keys items via
            (targetNamespace, name).

        WSDLTools.py --

            Made WSDL Collections into CollectionNS instances,
            this fixes problem with collisions, caused by wsdl:imports,
            between items with same name but defined in different
            targetNamespaces.  So now all items can be accessed via
            (namespace,name), but ONLY those items defined in
            WSDL.targetNamepsace (not an import.targetNamespace) can
            be accessed using just 'name'.

            Also changed how portType is "loaded".  Now instead of
            dropping all the operation nodes in "load", I drop
            the portType node into "load".  This makes sense because
            portType really should know about itself, and the
            XML Schema definition of "portType" includes an "anyAttribute"
            and I need to make this stuff available.  I may change the
            other WSDL information items to do this to be consistent.

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