Splitting get_deformation_field() from resample_image()
Commit for posterity - this does the wrong thing but may be interesting in future
Revert "Commit for posterity - this does the wrong thing but may be interesting in future"

This reverts commit f89971627c82426f5bdc9bc6a5ba56e0d30dfd1e.
Correctly creating control points from affine when nLevels is 0
Adding C code for (approximately) transforming points with a control point image
Updates to R transform code