[vtkusers] PCA statistics change

[David Thompson]

Hi Bill,

> Yes, VTKExamples does image based tests. They show up here:
> https://open.cdash.org/viewTest.php?onlypassed&buildid=5241214
> System name is mun.
> 
> I also submit a nightly under Remote Modules but I'm having some
> OSMesa issues right now,,,

Thanks! The fact that mun is passing means the image is still OK (I suppose because the view of the reprojected data is along the axis that's been flipped).

	David