* [THREAD_EXT,NEW] Added intermittent_thread/4 for leaning a goal that repeats every N seconds.
* [RDF_AXIOM,EXT] Added graph parameter to materialize/1.
* [RDF_AXIOM,NEW] Added start_materializer/2 for repeated materialization.
* [RDF_RANDOM,SC] New module concentrating the randomization pradicates for RDF data.