BUG: fixed #232 now slicereg algo option is insensitive to case
BUG: fixed #232 now slicereg algo option is insensitive to case

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox