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