[evlatests] u,v,w, and UVFIX

[Ken Sowinski]

On Wed, 8 Aug 2007, Gustaaf van Moorsel wrote:

> The results strongly suggest that John Benson's fix does not
> correct for differential aberration.  And that may be the
> correct thing to do (if u,v, and w are defined with respect
> to the tangent point), in which case we should consider
> changing the UVFIXPRM(18) default in UVFIX.

It also suggests that the u,v,w provided by calc at observe
time and written to the archive record do not account for
differential aberration.  That is in agreement with the comment
I saw in the calc wrapper that provides u,v,w.