OPT: download_data: added link to course_hawaii17 (#1291)
OPT: download_data: added link to course_hawaii17 (#1291)



Former-commit-id: 2aa02b2c95ad8e5b45ffd300574a17f0b70b38e5
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox