Feature request: NEMO model_mod interface for DART

[hkershaw-brown]

Use case

What are you trying to accomplish? Sometimes there may already be a way to do what you need.

model2obs users interesting in using NEMO

Is your feature request related to a problem?

Not a problem, this issue is just to keep track of the NEMO interface from Ali.

Describe your preferred solution

Use existing NEMO interface

Describe any alternatives you have considered

NEMO interface from scratch.