OPT: now downloading data only once
OPT: now downloading data only once

Former-commit-id: e671f7503def055e1ac8112e54eb260ffb9ef9be [formerly 4a4d1ad3f002130f485174f25f93878b5194bcad]
Former-commit-id: 57cc69d0c9f3c73c03de18b3491acf348c9cda18
Former-commit-id: e44d629dc488a3fcd7511a7ce0c7ca2fab8efd01
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox