* [DIR_EXT,FIX] has_file_type/2 would not work for variable instantiations.
* [FILE_EXT,NEW] Added copy_file/5, which is a shorthand for file_alternative/5 an copy_file/2.
* [FILE_EXT,NEW] Added file_lines/2 based on wc.
* [FILE_MIME,FIX] Added a check for file acces and existence.
* [RDF_SERIAL,EXT] Add default value to ensure_format/3.
* [VOID_STAT,SC] AP-compatible predicate, coming from SEMURI.