1. A big overhaul of module DCG_GENERIC: tested existing rules, added documentation, renamed rules, added new rules for peeking.

* [DCG_GENERIC,SC] Renamed predicates for consistency: dcg_all[_atom]//1, dcg_until[_atom]//1, dcg_without[_atom]//1.
* [DCG_GENERIC,NEW] Rewrote dcg_word//1 to use alpha_to_lower//1. Added wrapper DCG rule dcg_word_atom//1.
* [DCG_GENERIC,NEW] Added two nice DCG rules for peeking: dcg_peek_atom//1 and dcg_peek_length//2.
* [DCG_GENERIC,SC] Added documentation for several DCG rules.
* [SC] Updates several modules to use the new notation for plDoc v2 predicate comment headers.
1. [DCG_GENERIC] Peek for chars. 2. [LIST_SCRIPT] Nonexisting DONE file.

* [DCG_GENERIC,NEW] Added dcg_peek_char//1.
* [DEB_EXT,NEW] Added rdf_class_status/1 and rdf_graph_status/1 for writing the number of class individuals / graph triples to the screen.
* [LIST_SCRIPT,EXT] list_script/3 now handles the case in which the DONE file does not yet exist (it is then created).
* [ALEPH6,SC] Converted comments to the new argument tag of plDoc v2.