adds reduced formulation (down gradient) option for horiz momentum flux terms#25

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katsmith133 wants to merge 3 commits intovanroekel:ocean/addADCMixingfrom

katsmith133:ocean/addADCMixing

Commits on Oct 25, 2021

Commits on Oct 26, 2021

reduces unnecessary computations if using the horix down gradient mom flux option
katsmith133
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