BUG: dmri_moco: fixed bug when providing bvals file-- now using dipy
BUG: dmri_moco: fixed bug when providing bvals file-- now using dipy

Former-commit-id: 5c221a47d644c46aa6ffe22f562629344efb3dfb
Former-commit-id: fe7b4c18e840cafb79a42055e61a24884b60a48f
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox