NEW: option for asymmetric padding
NEW: option for asymmetric padding

Former-commit-id: 1182e7745c461c78c88cab518ad404ee29c05b02 [formerly 3b7f7613a494a08025152c66c6316ffc9a5a8565]
Former-commit-id: 37f76ab3e69b092d5b51b5fbb8f005db7756ec46
Former-commit-id: 6dd3a8a8a55019a2ea7ef76d71e68dae6ff212eb
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox