Indexing image directly, rather than using getData()
Allowing for logical data in newMriImageWithData(), so that (e.g.) "image > 0" works
Removing functions for converting between old data type and NIfTI codes; adding quaternion functions
Updating MriImage#isReordered(); warning if indexing into an image which is not reordered
Updating "nifti" coercion methods to allow arbitrary xforms