BUG: correct the origin of the image after a padding according to the qform matrix (that contains the origin before the padding, the angles of the images and the spacing)
BUG: correct the origin of the image after a padding according to the qform matrix (that contains the origin before the padding, the angles of the images and the spacing)

Former-commit-id: 13a2dbe1a11ee25cb3583a80790ba4bbeeaa680a
Former-commit-id: 89b388fc641bd2a5aaedccc88e83c5c735fe72c3
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox