remove statements containing owl:sameAs after a smushing job

[luigiselmi]

After smushing, in which a single target (or preferred) uri replaces all the aliases within the fusepool.info domain, the owl:sameAs statement sent to the smushing service are added to the graph. Those owl:sameAs statements should not be stored as after the smushing those aliases uri are replaced from all the statements and so they will not be used anymore. Only owl:sameAs statements that link a uri in the fusepool domain to a uri in another dataset (i.e. dbpedia.org) must be preserved.

[retog]

A problematic issue because we must also ensure URI persistence. So we should somehow ensure only the just imported URIs get deleted.