wrote a booster wrapper -- still needs to be documented.
caught a bug in metaboostProc that named attribute 'boosterOuput', NOT 'boosterOutput'.
wrote (and exported) wrapAggregator and accompanying unit tests.
updated roxumentation for wrapAggregator.
updated roxumentation and exported wrapBooster.
updated .Rd files to reflect new cross-linking via 'weldr wrappers' family.