Removed the color markers in redirected messages.
Removed the color markers in redirected messages.

When writing to file, the print statement will exclude the color
markers from the message.


Former-commit-id: 6bfe58b6b174b1f283f27c90de9a5f3d2bcb6503
Former-commit-id: 4e625cb14982b17fc4f21aeebbf5b9c61dc9171f
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox