Merge pull request #558 from RosettaCommons/dougrenfrew/tcre_energy_methods_clean
Adding a two-component reference energy (TCRE, a.k.a. split unfolded) term. It is intended to serve as a replacement for the unfolded term and should be applicable for the design of alpha/beta/gamma-peptides, peptoids, OOPs, HBSs, and other NCBBs as it is evaluated based on atom type composition.
Riley and Andy have contributed this greatly.