[vtkusers] vtkGPUVolumeRayCastMapper (OpenGL2) - Mask Input update

[meow_fiz]

I'm not sure it's the best solution. It seems like it's slower than in Vtk6.3
&OpenGl1.x backend.

Is it optimal solution to update modified mask volume to call
LoadMaskMethod? 

The whole volume rendering on GPU doesn't look faster than in previous
approach. I've read some threads about changing
SetMaximumImageSampleDistance &SetAutoAdjustSampleDistances but it didn't
affect the rendering frame rates ...



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