OPT: register_to_template: back to latest commit (without smoothing seg)-- passes test
OPT: register_to_template: back to latest commit (without smoothing seg)-- passes test

Former-commit-id: 7ad0d9a9438e9cfe5204bf4389226686e38c0ab0
Former-commit-id: 17ba2477c4974e6d9c98015463ceaff07fea5fa5
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox