DEV: atlas: now added CSF and GM-- still need to fix final results (weird signal)
DEV: atlas: now added CSF and GM-- still need to fix final results (weird signal)

Former-commit-id: 55f5fc80e4d9adc865470ff42df48c11f18cf169 [formerly e972f6680b04bd305905dfa05b22ba6fe062c51b]
Former-commit-id: 121ed00e6f2347d547494f66f0f7c436fd004a5d
Former-commit-id: 83c73df5e3640ab62956fcf98ab0526e196a9596
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox