Merge pull request #1564 from RosettaCommons/vmullig/calc_pnear
Minor bugfix to BinTransitionData, and small tweak to PNear output in simple_cycpep_predict (MPI mode)
The BinTransitionData module was using utility_exit instead of throwing an exception, which brought down MPI jobs since it couldn't be handled by a try/catch block to kill the current job without bringing everything down. Also, PNear output was happening even if no native structure was provided.
Minor, cosmetic changes expected to MPI-mode integration test output.