BUG: Use tmp_create from sct_utils. Fix #685.
BUG: Use tmp_create from sct_utils. Fix #685.

Former-commit-id: 2aa816cf9cef883b3cb4fe6e7dd5e02296a5399f
Former-commit-id: b01cbb124258566476c57fb3c35b04a6a42b66c7
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox