Clarified cropping strategy for sct_apply_transfo; remove warning (#2811)
Clarified cropping strategy for sct_apply_transfo; remove warning (#2811)

Fixes #2810
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox