Description

Use a larger hexahedron of points on the coarse mesh and a larger number of polynomials to approximate the function to the corresponding order. Adapt the transfer stencil accordingly. The code is now generic for arbitrary interpolation order in n dimensions.

For general curvilinear meshes, a generic interpolation scheme is used instead of the multigrid-like approach because we cannot assume that one grid is coarser everywhere than the other one for two general curvilinear meshes.