Use more subtle exclusion for aucint.inf.obs and aucint.inf.pred

[billdenney]

Currently, aucint.inf.obs and aucint.inf.pred are automatically excluded if the half-life calculation is excluded because they depend on lambda.z. But, that should only occur when the extrapolation is actually used.

To change the exclusion to be conditional would be complex because it would require knowing if lambda.z was used.