Changed estimation of aerodynamic resistance to include windlessexchange coefficient also when using the Richardson number for estimating stability correction.
Now adding the windlessexchange value in a similar as when using Monin-Obukhov length approach for stability correction. This is appropriate for potential transpiration, snow and soil evaporation.
Also changed to use Monin-Obukhov as default value for snow and soil evaporation. PEJ and DG