* [SC] Improved PGC initialization by placing module-dependent operations into a separate file.
* [SC] Many missing module imports.
* [FIX] Problems during startup with asserting the RDF for MIME content types.
* [DEB_EXT.NEW] Added catch_debug/3.
* [DIR_INFRA,SC] Taken the predicates that support a specific infrastructure of directories from DIR_EXT.
* [DIR_INFRA,SC] Taken the setting of the data directory from the command-line argument processing library.
* [HTTP_DOWNLOAD,HTTP_DOWNLOAD_EXT,SC] Split predicates for downloading over HTTP(S) from URL manipulation predicates in URI_EXT.
* [HTTP_GOAL,SC] Split running goals over HTPP into a separate module.
* [RDF_SERIAL,NEW] Added rdf_file_correct_extension/2, coming from an individual script.
* [RDF_STRING,FIX] rdf_retractall_string/3 was not exported.
* [SAFE_FILE,SC] Taken the predicates for safe file oprtation from FILE_EXT.
* [URI_EXT,SC] Split part into HTTP_DOWNLOAD and HTTP_DOWNLOAD_EXT.
* [URI_EXT,NEW] Added url_directory/3.