OPT: allow to create float value labels
OPT: allow to create float value labels

Former-commit-id: a805999f0dd93a1ed211286c6ebde4da8e072120 [formerly ab07865035d1628adc37c7cfc222633f6a3223e8]
Former-commit-id: b77e0ddf66809988ea0d41151a3486c01bc32391
Former-commit-id: ae178828eab902e3ed710e19a5ad51b213e0933c
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox