[vtkusers] Standardizing Where Normals are Stored

[David Doria]

There seems to be 10,000 (ok maybe I'm exaggerating) ways that one can store
normals in a vtp file:
1) in an array that you name, ie Normals
polydata->GetPointData()->GetArray("Normals")

2) associate them with the points
polydata->GetPointData()->GetNormals()

3) associate them with the cells
polydata->GetCellData()->GetNormals()

4) associate them with the cells but name them
polydata->GetCellData()->GetNormals("cellNormals")

It is painful to have to check for normals in all of these places when
reading in a vtp. Does anyone else have this problem?

Thanks,

David
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