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Write uniform and rectilinear grids to legacy VTK files

Kenneth Moreland requested to merge kmorel/vtk-m:write-uniform-rectilinear into master

As a programming convenience, all vtkm::cont::DataSet written by vtkm::io::VTKDataSetWriter were written as a structured grid. Although technically correct, it changed the structure of the data. This meant that if you wanted to capture data to run elsewhere, it would run as a different data type. This was particularly frustrating if the data of that structure was causing problems and you wanted to debug it.

Now, VTKDataSetWriter checks the type of the CoordinateSystem to determine whether the data should be written out as STRUCTURED_POINTS (i.e. a uniform grid), RECTILINEAR_GRID, or STRUCTURED_GRID (curvilinear).

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