Rayleigh damping

[xylar]

We need to add Rayleigh damping to Omega. This is a critical part of dynamic adjustment used to damp out fast waves so we have an initial condition for E3SM that doesn't require prohibitively tiny time steps.

[xylar]

@vanroekel and @sbrus89, could this make its way onto the development plan?

[xylar]

It looks like a couple of hours work max with AI help.

[vanroekel]

Great point, I'll get this on the dev list.