[phenixbb] R, Rfree, and wxu_scale

[Pavel Afonine]

> Forgive me for saying this but the object of refinement is to build the most accurate model, not to obtain the lowest Rvalue,
> which will vary with weights applied to diffraction data versus constraints. 

This is all true. Although if one observe increase in Rfree, it is cheap 
to try a few simple and obvious things to see if one can fix it.

> There have been multiple posts about this on
> crystallographic BBs in the last few months ...
>   

Yes, some of these issues were brougt up in the past in phenixbb (not 
100% sure, but feels like this).

Pavel.