* [RFC4234_BASIC,RFC2616_BASIC,FIX] Remove plDoc warnings.
* [APP_SERVER,FIX] While developing the server should not give the public host and port name.
* [APP_SERVER,SC] Naming of HTTP port in line with ClioPatria.
* [DBPEDIA,FIX] Added missing RDFS XML namespace and SPARQL prefix.
* [HTTP,SC] Removed incorrect uses of library http/http_parameters in several locations.
Improvements to DBpedia SPARQL querying.

* [DBPEDIA,SC] Renamed find_dbpedia_agent/4 to dbpedia_find_agent/4.
* [DBPEDIA,EXT] Rewrote and merged assert_identity_resource/2 and assert_resource into dbpedia_assert_resource/3 providing identity closure as an option.
* [DBPEDIA,EXT] dbpedia_find_concept/3 returns the given concept name in case it is a concept.
* [RDFS_LABEL_READ,DOC] Documented the extensions rdfs_label2/3 provides on top of rdfs_label/2 in library semweb/rdfs.
* [SPARQL_SAMEAS,SC] Removed describe_sameas/3. Merged into DBPEDIA resource assertion. This will be moved to SPARQL_EXT later.