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Resolve "VTK-m filter implementations should not copy fields"

Adding API to DataSet to CopyStructure from another dataset. This copies the cellsets and coordinate systems while leaving the fields unchanged.

CreateResult no longer copies all input fields to the output dataset created.

Furthermore, if a Filter subclass doesn't provide MapFieldOntoOutput, then the default implementation simply copies only the selected fields to the output dataset.

Closes #220 (closed)

Edited by Utkarsh Ayachit

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