Set output to vtkMultiBlockDataSet instead of vtkMultiPieceDataSet in Contour3DLinearGrid filter

Cory Quammenrequested to merge
cory.quammen/vtk:contour3d-linear-output into master

vtkMultiBlockDataSet preserves datasets organized in a hierarchy.

Edited by Mathieu Westphal (Kitware)

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