Add call to parse (preprocessed) raptor logs directly for BRAGG.

Updated XSL to include counts of failures at each severity, and also the new effect/causes distinction, for failures that are not package specific.

New script which parses raptor logs directly to produce a BRAG summary. New version of XML structure accommodates causes of failure as well as the effect of the failure, and deals with excessive error messages. New structure also avoids a potential problem (bug?, questionable feature?) that both IE and firefox exhibit. Some simplifications of brag utilities module.