Plane transformations are not being applied to wavefront tilt terms

[andykee]

Plane transformations (Rotate and Flip) are only applied to Wavefront's data attribute at the moment. This is fine, unless the Wavefront's tilt attribute is populated. This is pretty clear from the example below:

import lentil
pupil = lentil.Pupil(amplitude=lentil.util.circle((256, 256), 128), diameter=1,
                     focal_length=10, pixelscale=1/256)
detector = lentil.Detector(pixelscale=5e-6, shape=(1024, 1024))
psf = lentil.propagate([pupil, detector], wave=650e-9, npix=(64, 64))

tilt = lentil.Tilt(x=10e-6, y=0)
psf = lentil.propagate([tilt, pupil, detector], wave=650e-9, npix=(64, 64))

psf = lentil.propagate([tilt, pupil, lentil.Rotate(angle=30), detector], wave=650e-9, npix=(64, 64))

I'm not entirely sure how to deal with this yet, but I wanted to capture the problem before I forgot.