These really belong in isetbio, and several were just stubs.  Deleted them here.

I incorparted the substance of v_ibRadiance, v_ptbisetCones, v_ptbisetisomerizations into isetbio v_PTB_vs_ISETBIOIrradianceIsomerizations.

I will stick v_cones, whch currently crashes, somewhere into isetbio.

ptbConesIsomerizationsFromRadiance is already in isetbio, as part of the ptb package.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>