DOC: check if user is sudo (if so, inform and exit program)
DOC: check if user is sudo (if so, inform and exit program)

Former-commit-id: cbda93473351618e7a2641044e57a9abd548cbc8 [formerly da22db5f0fea6304709a7d0036c8cee4d33df1fc]
Former-commit-id: 787adfe7001e9c8e5fea6f7a7cb57c88dfcbb434
Former-commit-id: 2417bbbdadbb017bfb9495a9f5948b7550aa91dc
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox