purge relations

[cvandeplas]

just a TODO to track down

    def purge_relations_from_itself(self, names: list) -> None:
        raise NotImplementedError('Not implemented yet')
        # FIXME figure out a way to implement this
        # ask user for the sources of UUIDs that were autogenerated, load them to a list and have them inputed here
        # keep the other ones as relation
        pass

prune_relations(List[galaxy names])