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Add support for Polyhedron cells

Armin Wehrfritz requested to merge awehrfritz/xdmf:add_polyhedron_support into master

Elements of type Polyhedron (i.e. N face cells, where each face is a M edge polygon) are in the following format: [nCellFaces, nFace0Pts, id0_0, id0_1, ..., nFace1Pts, id1_0, id1_1, ..., ...]

This has first been proposed in a MR to VTK (vtk/vtk!1255 (closed)), which contains the necessary changes to VTK. The VTK MR also has example/test files attached that demonstrated the functionality.

Ping: @demarle

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