REF: sct_check_dependences: added parser and changed options. related to #669.
REF: sct_check_dependences: added parser and changed options. related to #669.

Former-commit-id: 9d8b09859b726c5fb312670b21c4335dd0395ab0
Former-commit-id: 212a9c618c39b2e63aa7c3c4022edef5f6799ca2
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox