[json] fix json serialization for recent simplejson implementation, and test encoding of entities as with earlier simplejson implementation, iterencode internal stuff is a generated function, we can't anymore rely on the _iterencode overriding trick, so move on by stoping isinstance(Entity, dict). This is a much heavier change than expected but it was expected to be done at some point, so let's go that way.

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# copyright %(year)s %(author)s, all rights reserved.

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# contact %(author-web-site)s -- mailto:%(author-email)s

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#

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%(long-license)s

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"""%(distname)s specific hooks and operations"""