OPT: parser updated from branch bdl_greymatterseg  GRATIO
OPT: parser updated from branch bdl_greymatterseg
 GRATIO

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