[vtkusers] fix for large OpenGL Textures

[Joris Vanden Wyngaerd]

Hi,

OpenGL has a maximum texture size (defined by GL_MAX_TEXTURE_SIZE), which
depends on your video card/drivers.
vtk resamples an image in vtkOpenGLTexture but does not take into account
this maximum. I include a fix that does take it into account.


================
Joris Vanden Wyngaerd
coordinates : http://www.esat.kuleuven.ac.be/~joris/personalia.html

"Quand les degoûtés s'en vont il ne restent que les degoûtants"

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