ENH: Merge changes from main tree into VTK-5-2 branch. (cvs -q up -j1.30 -j1.31 Common/vtkPerspectiveTransform.cxx)
ENH: Merge changes from main tree into VTK-5-2 branch. (cvs -q up -j1.30 -j1.31 Common/vtkPerspectiveTransform.cxx)

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