BUG: fixed issue with nibble and float16
BUG: fixed issue with nibble and float16

Former-commit-id: 392bcf5bf73c8a0383561664f3452c35579f1239 [formerly aa482ddd951fb66f39899abe9dd8cda8744bc013]
Former-commit-id: 6c8bd8dcf458eaef387818cdf5dad3c526304560
Former-commit-id: 248d52c78638c4cf259e64fd19a13f6514d20cf9
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox