It looks like we no longer support `horiz_winds` as a nudging variable

[AaronDonahue]

With the changes we made to support U and V as nudging fields it looks like we've lost support for horiz_winds as a nudging field. This is an issue for cases where the data used for nudging comes from older SCREAM runs and we don't have U and V as output, instead they are combined into horiz_winds.

[bartgol]

I think this was on purpose. We are assuming all nudged vars have layout (ncols,nlevs). horiz_winds does not fit into this pattern.

How important is it to use old scream runs as nudging data?