Remove code deprecated before 6
For example:
Common/Core/vtkSetGet.h:// VTK_LEGACY_BODY(vtkMyClass::MyOldMethod, "VTK 5.0");
vtkBiQuadraticQuad.cxx: VTK_LEGACY_REPLACED_BODY(InterpolationDerivs, "VTK 5.2",
For example:
Common/Core/vtkSetGet.h:// VTK_LEGACY_BODY(vtkMyClass::MyOldMethod, "VTK 5.0");
vtkBiQuadraticQuad.cxx: VTK_LEGACY_REPLACED_BODY(InterpolationDerivs, "VTK 5.2",