OptCysHG
run optH on non-disulfided bonded CYS only; meant to relieve any
clashes caused by swapping of CYD->CYS after calling
Conformation::detect_disulfides()
ReadResfileAndObeyLengthEvents
written by flo, feb 2011 class that can apply a resfile to a pose
that had its length changed at some point in a protocol.