OPT: crop: removed FSL dependency: fslroi
OPT: crop: removed FSL dependency: fslroi

Former-commit-id: 3ec699d94e37c2f61b9cf25431ea1eeaf8ebd576 [formerly a2963df0c3b74a289e0c1a2e4bdbd1a100f161ee]
Former-commit-id: 47743fb1fa9e98787117cafb7e8be6cd86e8cfe2
Former-commit-id: 6d8943c164253710ff3282ac0060fa1bbc6a9584
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox