REF: separate validation flags for extensive testing
REF: separate validation flags for extensive testing

Former-commit-id: 7f5b11a84a9f77880b7ea1bac3311b142ab937d2
Former-commit-id: 7444aa87dabd8edf61108a6a57b9ee5f2a2ffc5c
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox