Merge pull request #4592 from RosettaCommons/vmullig/add_cys_sidechain_conjugation_patch
Adding CYS:SidechainConjugation patch.
It's a bit silly that we still have CYX for sidechain conjugation to cysteine. This adds a CYS:SidechainConjugation patch. For now, I won't remove CYX, since it's probably needed for backwards-compatibility with a lot of things.