OPT: made usage
OPT: made usage

Former-commit-id: 499af92a648b57d720e1b454fe0bbb484fa31b91
Former-commit-id: 861807a8790297dfe0da85b16378ef844fb16020
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox