BUG: fix bug when computing CSA (due to resolution correction)
BUG: fix bug when computing CSA (due to resolution correction)

Former-commit-id: d2c9efc5f6985346048c802c0f77c7326604b6c3 [formerly 039d012bd12739a50ccccfaa21d3d7a8456e38ec]
Former-commit-id: 1597470933d124a39c60259b0041e4f717f8fa76
Former-commit-id: 4dd8c8956737b41b979f9ba52af9f9b9e64b8c54
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox