Created function set_line_to_display.
Created function set_line_to_display.


Former-commit-id: 61c5ba969831a41e722422be03c77f8401798dc3
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox