Stable working release

Adjust default nifti header creation regarding ‘pixdim’ field, respon…

…sible for shifting xform origin coords

new default behavior: grab 'pixdim' from original nifti header if it exists OR, fallback: set default pixdim field to [... 3 1 1 1] (previously [... 0 0 0 0])

mrTools public release 4.7

Fixing stray text that snuck in