Consolidation of recent changes to SPARQL and LOD modules:
  1. SPARQL prefix registration removed, all and only XML namespaces are SPARQL prefixes now.
  2. New module for storing LOD locations, i.e. LOD descriptions of resources that are stored at a URL different from the resource IRI's prefix.
  3. New module for querying LOD. This uses SPARQL and RDF file downloads, as well as dedicated clause for flickr wrappr resources.
  4. New module for SPARQL caching.
  5. New module for SPARQL iterative caching.
  6. All SPARQL registrations have moved to module 'SPARQL_db'.
  7. Reworte module row_ext for handling SPARQL query results (= row compound terms), adding propositions and resources.
  8. Cleanup: removed 'SPARQL_assert'/4, dbpedia_assert/3, dbpedia_describe/3, dbpedia_find/2.
  9. New module supporting flickrwrappr.