* [GV_DCG,FIX] Newlines should only be printed if some lines were printed before them. Added two checks for this.
* [RDF_NAME,FIX] URI descriptions would not always be printed.
* [RDF_NAME,EXT] Added values `only_literals` and `only_preferred_label` for option `uri_desc`.
Merge branch 'master' of https://github.com/wouterbeek/PrologGenericsCollection