updated batch_processing: faster T1 registration
updated batch_processing: faster T1 registration


Former-commit-id: 098709bf8a8bb928f917695d08a91c10cda3f359
Former-commit-id: e540e08b7e0883ff8e9cf81f9a6c9a443b756d37
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox