Use area ice ('ai') fluxes for ice -> ocn coupling #10
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Coupling requires the average flux over the entire grid cell, as opposed to fluxes averaged over the ice area ("local" fluxes). Previously we used the "local" fluxes and scaled these by the ice fraction at the end of the time step to obtain grid cell averaged fluxes. This does not conserve fluxes when small ice areas are zapped - the ice fraction goes to zero and these fluxes are lost.
This PR uses the correct '_ai' fluxes avoiding this issue.