Make the input file path explicit
Make the input file path explicit

Making the input path explicit, it makes the code easier to debug, but special
characters in the path might cause errors if passed into command. Wrapping the
path in double quotes solves this problem.


Former-commit-id: 26ebdd9ff3cc84b411cc328e9c159e8bf836ecb7
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox