Merge pull request #1513 from RosettaCommons/rhiju/reconcile_bps_input_pdb_farna
Rhiju/reconcile bps input pdb farna
+ this was needed to model eterna switches in 3D
+ changed behavior of bps_moves ("base_pair_step moves") to not move residues inherited from input PDBs. Makes SRP modeling cases (e.g. in integration test) worse, but more consistent with other conventions that we've used for, e.g., stepwise.