NEW: use .json files to specify which data to use for testing
NEW: use .json files to specify which data to use for testing

Former-commit-id: 317482cedf1b5598b95fac8d0b49a13ad850d6e5 [formerly da03665c2b5c735ccd3cd6b54658e964b8df632c]
Former-commit-id: 2127ca02c7de3c8fbb790ef4fa03f223d9ace6db
Former-commit-id: 3fd9bdd1c70202379dad0b3992a5a8438873e60c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox