* [CSV_TO_RDF,FIX] Replace spaces with underscores, not dashes.
* [RDF_DOWNLOAD,NEW] Added this new module, supporting RDF data to be loaded in a graph, incuding freshness lifetime checking on the original source, possibly redownloading data if needed.
* [RDF_GRAPH,NEW] Added is_fresh_rdf_graph/2, is_rdf_graph/1, and rdf_graph_age/2.