NEW: msct_gmseg_utils: add error_map in the LOOCV function
NEW: msct_gmseg_utils: add error_map in the LOOCV function

Former-commit-id: 7bb31ee6fb57ef5bc0bf5a5f9d90d728400f761c [formerly afff6cf4cee205b6c8eccfbd3635e48287115c4f]
Former-commit-id: ab0d241fbcf10dd3ac02ada4ada61aed5b41ba95
Former-commit-id: fffb677914a04b20477849399252b1eaa7bc0a2a
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox