Add an option in hor_visc to adopt velocity thickness from continuity solver #579
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Runtime parameter
USE_CONT_THICKNESS
is added in horizontal viscosity to let it use velocity-point thickness consistent with the continuity solver. Thickness at velocity points simply uses h[uv] in BT_cont type. So the option only applies to split mode.The purpose of this PR is to open the way for tests. A more general (and careful) implementation can be added later.