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Set COPYTUPLE attribute to ensure tuple-by-tuple copying of attribute data

There are several options to copying attribute data. Specifying COPYTUPLE
ensures that the data is copied on a tuple-by-tuple basis. Without this
flag, and in situations where collapsing of dimensions of cell topology
occurs (i.e., polygons become lines), segfaults were occuring. See also
vtkCleanPolyData which performs similar operations.
Edited by Will Schroeder

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