Many small updates to DCG, ISO, RDF(S).

* [DCG_GENERIC,NEW] Added dcg_word//1, dcg_atom_without//2, dcg_codes_without//2.
* [DCG_GENERIC,EXT] Extended dcg_atom_all//1 and dcg_atom_until to work with the atom argument either instantiated or uninstantiated.
* [ISO_3166_1,ISO_639_1,ISO_639_2,ISO_639_3,ISO_639_5,SC] Renamed predicates to be easily usable across modules.
* [ISO_3166_1,ISO_639_1,ISO_639_2,ISO_639_3,ISO_639_5,SC] Using XML namespaces to abbreviate the Lexvo resource terms.
* [ISO_8859_1,SC] Empty module removed.
* [RDF_CLEAN,NEW] Added rdf_replace_namespace_predicate/5.
* [RDF_YEAR,NEW] New module concentrating predicates for cleaning RDF literals with year information and predicates for asserting year triples. See module DCG_YEAR for parsing text into a year term that is compatible with this module.
* [RDFS_BUILD,NEW] Added rdfs_assert_class/2, rdfs_assert_property_class/2, rdfs)assert_property/2.