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vtkFieldData range caching fixes

Yohann Bearzi (Kitware) requested to merge yohann.bearzi/vtk:field-data-range-fixe into master

When computing the range for components, the backend used by vtkDataArray computes the ranges for all components at once. This was not taken into account in vtkFieldData::GetRange, and memory could be written over by this process. The backend of vtkDataArray::ComputeScalarRange and vtkDataArray::ComputeVectorRange is now directly used by vtkFieldData. Since those methods are protected, vtkDataArray is now friend with vtkFieldData.

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