Merge pull request #300 from RosettaCommons/phbradley/lk_ball_update
Updates to the lk-ball energy term, to improve compatibility with minpack and linmem ig. Integration test changes due to extra core.chemical Tracer output (new atom properties associated with the lk_ball_wtd term). Two broken cenrot unit tests were already broken in trunk, maybe by the recent lbfgs checkin?