* [HTTP,SC] Removed http_parameters_fail/2.
* [OPTION_EXT,SC] Extensive cleanup operation.
* [ORDSET_EXT,NEW] Added rows_to_ord_set/2.
* [PAIR_EXT,SC] New module for pairs, taken from LIST_EXT. Removed some duplicate predicates.
* [SPARFQL_SAMEAS,EXT] Working on describing resources under identity closure.