Fix vtkDataLabelRepresentation + vtkGL2PSExporter compatibility
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The current implementation ultimately uses a vtkTextMapper + vtkActor, which should be replaced by a vtkTextActor.
Alternatively, a special case can be added vtkPVGL2PSExporter to recognize vtkLabeledDataMapper as a special case for exporting text, though this will not add MathText support as vtkTextActor will.