Merge pull request #5122 from RosettaCommons/roccomoretti/fix_PoseRTS_get_variants
Fix issue with PoseResidueTypeSet::get_all_types_with_variants_aa()
It looks like that due to caching behavior, PoseResidueTypeSet::get_all_types_with_variants_aa() will "double up" the underlying residue types.
It turns out that special casing this function isn't necessary, as the base class implementation effectively only uses the public interface which is properly overloaded.