* O: No longer reload the same vocabulary graph (e.g. dcterms) again and again.
* ADDED: Skip certain IRIs based on their domain name (e.g. wikipedia).
* ADDED: rdf_setup_call_cleanup/3 for RDF meta-predicates for which we do not want to save the results to file.
If option graph/1 is given the graph is preserved, otherwise it is cleared.
* ADDED: Register extra HTTP headers for certain LOD IRIs in order to retrieve machine-readable content.
ADDED: New caching method, used for WebQR's LOD caching.
SC: Big cleanup of all faceted browsing code for RDF.
EXT: Add graph to  URL's search for RDF tabular.