RelativePermeability: Need separate colors for Krow and Krog if giving SOF3 input

[asnyv]

Originally identified by a user.

A bit of a tricky issue, I don't know yet what would be natural behavior.

The issue is that if using SOF3 Eclipse input, you will have a table for oil in water relperm (Krow) and oil in gas (and connate water) relperm (Krog), both as functions of oil saturation (So). If coloring by "Curve", the oil relperms are colored green as by convention, but in this case we could end up plotting Krow(So) and Krog(So) in the same plot, making them impossible to separate other than by hover labels.

[asnyv]

Have asked a few that have more relperm/SCAL competence, and they all recommend to convert So to Sw and Sg. Thus let Krow be plotted as Krow(Sw) together with Krw(Sw), and Krog as Krog(Sg) together with Krg(Sg).

Have to make sure to account for irreducible water saturation when converting between So and Sg