OPT: do not unpad straight landmarks, otherwise output data cab be cropped at the edge, causing landmarks to disappear
OPT: do not unpad straight landmarks, otherwise output data cab be cropped at the edge, causing landmarks to disappear

Former-commit-id: 5ad1f1aa9c3625795d10b23a6d98ca3668095fef
Former-commit-id: 393a47fcb130248883257281f243e439a6e5b85e
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox