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

Former-commit-id: 3a2f437498c6d471dfe8480ec90a8127e2c57e47
Former-commit-id: 167848dc2693ee651981728c6e17fd714c44047e
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox