Merge pull request #1222 from RosettaCommons/jadolfbr/fix_rsd_copy_op
Remove RT copy operation from DisulfideAtomIndices
Fix ResidueType access in DisulfideAtomIndices where we are getting an actual copy of the residue type from a residue instead of a const reference as we should be. This should speed up code a little bit when doing much residue deletion and additions.
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