[table view] some new table view enhancements * rewrite entiy table view column renderers to use default_* methods instead of lambda so that column_renderers may be properly deep-copied * new RelatedEntitiesColRenderer * default addcount to false on RelatedEntityColRenderer * more doc

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if schema['TZDatetime'].eid is None:

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    add_entity_type('TZDatetime')

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if schema['TZTime'].eid is None:

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    add_entity_type('TZTime')