Support high order for Nek5000 reader
Nek5000 solves in high-order (N can ba larger than 10). As far as I know, vtk now supports high order format (at least up to N=10).
Paraview's current Nek5000 reader (from VisitBridge?) turns high order into linear. It actually turns a Nth order polynomial element into (N+1)^d linear Cells. So, I wonder if you can support nek5000 format further.
Maybe it's better to ask users using high order CellType or not when reading the file.
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