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Velocity Del4 tendency is not invariant w.r.t number of MPI tasks #376

@mwarusz

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@mwarusz

Noticed while testing #375, but unrelated to it. I am seeing baseline comparison fails for ocean/planar/manufactured_solution/convergence_both/del4, but only when more MPI tasks are used for the PR tests than were used for the baseline. Turns out this also happens on develop.

I already have a fix. We need to exchange state halos at every RK stage.

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