* [RDF_DATATYPE,NEW] Added rdf_datatype/3 for translating an atomic literal to its corresponding value.
* [RDF_GC_GRAPH,FIX] Removed deleted graph from administation as well.
* [RDF_GC_GRAPH,DEB] Add debug message for every unloaded graph, showing the duration since the last touch and the number of triples removed.
* [RDF_TABULAR,EXT] Display the total number of triples in the first rather thant the last table row.