Merge pull request #2947 from RosettaCommons/sboyken/keep_info_labels_symmetric
options to preserve PDBInfoLabels when detecting / generating symmetric poses; works with SetupForSymmetry and DetectSymmetry movers by simply adding keep_pdb_info_labels="true" to these movers. Longterm would be good to decide whether people want this to be default, and could be hooked into deeper symmetry code