I think DGLC needs area correction factors for fluxes sent back to the mediator

[billsacks]

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As in https://github.com/ESCOMP/CISM-wrapper/issues/69, I think DGLC needs to apply a correction factor between the model's internal areas and the grid cell areas on the mesh file that is used to create the mappings between components. As in that CISM issue, I think DGLC should have area correction factors for the runoff fluxes sent to the mediator, though I'm not 100% sure of this, and we should think this through further.

@mvertens @Katetc