Remove the getJD() method, which exactly duplicated another method. One KSNumbers method down, N to go.
Use minimal includes, cut 13% off build time
remove dead code
Add more conversions to radians
Have AstroVars functions work with radians
Remove dead code from KSNumbers, which was also copied to AstroVars
Oops, was slightly too overzealous with dead code removal.
Add an implementation of aberration.

This should be used as a stopgap until we have a better method.
The problem is that aberration isn't quite like the other transforms
we do in terms of being a rotation of 3d space. However, it is apparently
a Lorentz transform, so I think that it should be possible to do
things linear-algebraically? I'm not sure.

There should really be a de-aberrate function, as well.

Note also that we do the aberration conversion in ecliptic coordinates for
clarity of implementation. Use the appropriate functions to change coordinates
first.
Correct typo