Rewrote the launching of the viewer.
Rewrote the launching of the viewer.


Former-commit-id: 750119b64f2519303e7dda25a9f464ede71ffc0c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox