sct_image: remove change_orientation_nd()
sct_image: remove change_orientation_nd()


Former-commit-id: e77c62ebd786f7e2918db256fff8405d902ebd5f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox