TEST: created test for sct_compute_mtr
TEST: created test for sct_compute_mtr

Former-commit-id: d1a71861703024891747767b925d81b6ef0ecca4 [formerly 2f6b019bdad278885137170aac83e149642af05d]
Former-commit-id: 9c4031869d4090b41dab3ec610b7d30e1fef2c6f
Former-commit-id: 12ef48b79a95f6e3b53aed364a0b513eb6db8a41
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox