Carpet/CarpetLib: Add Lagrange_third_order_prolong prolongation option.

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Issue #2189 open
Zach Etienne created an issue

When the default prolongation type is chosen in a dynamical spacetime evolution, hydrodynamic and GRMHD fields can suffer from spurious oscillations generated at AMR refinement boundaries due to the high-order Lagrange polynomial prolongation.

As there is no way to directly specify the prolongation order in the interface.ccl, I have created a Carpet pull request that adds the desired order (3rd) Lagrange polynomial prolongation:

I would like this to be the default prolongation option for IllinoisGRMHD and GiRaFFE, so it would be immediately useful.

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