[Neuroimaging] Nibabel API change - always read as float

[Satrajit Ghosh]

hi matthew,

I don't know of any software that does behave differently for
> scl_slope of 0 or 1 - but I'd certainly like to know if there is any.
>

ITK:

https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/IO/NIFTI/src/itkNiftiImageIO.cxx#L398

and in the read function:

https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/IO/NIFTI/src/itkNiftiImageIO.cxx#L523


CIFTI/NIFTI2 library:

https://github.com/Washington-University/CiftiLib/blob/master/Nifti/NiftiHeader.cxx#L115


niftilib:

http://anonscm.debian.org/cgit/pkg-exppsy/nifticlib.git/tree/niftilib/nifti1_io.c#n5438

cheers,

satra
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