Update DRSDTCON keyword with regimes and option for GAS/WATER

[gdfldm]

Extended DRSDTCON with regimes, and option for GAS/WATER
See OPM/opm-simulators#5491

[blattms]

We might have a race-condition with #435. If that is merged first this one might have conflicts. Would that be a problem for you @gdfldm?

[gdfldm]

Would that be a problem

I think it would be ok.

[blattms]

Thanks.
Unfortunately, this now needs a rebase.

[gdfldm]

this now needs a rebase.

I think all of the conflicts have now been resolved

[blattms]

Thanks. Let's see what @totto82 has to say.

[totto82]

Thanks, it mostly looks good.

You write: "CHI typically varies from 0.01 - 0.1 depending on reservoir properties. "

The way the model is formulated, CHI and PSI are independent on reservoir properties by definition. (Omega is probably not, but also less important). Fine-scale simulations indicates that 0.04+-0.01 are reasonable numbers for CHI. The idea is that the user does not need to do fine-scale simulations themselves but can use the numbers reported in the paper. So 0.04 is a good default and the mean value given in the paper.

Where did you get the number 0.01 to 0.1 from?

I also notices a spelling mistake "dissoved"

[gdfldm]

Where did you get the number 0.01 to 0.1 from?

This came from the previous definition of DRSDTCON in an earlier version of the manual

[gdfldm]

@totto82. Thanks for the review.
I have removed the typical range, and expanded the discussion of the CHI value.