AnyRsetView: Refactor the columns_name method and update doc. We drop the 'label_column_%s' % colidx pattern and add a clean column_label method that might be overwritten by children class to alter the way default columns headers are computed.

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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')