Rescale odd texture sizes (257x257, etc.) so that the OSG texture loader
doesn't need to do this on the fly. OpenGL requires that texture dimensions be a power of 2 (32, 64, 128, 256, 512, 1024, 2048, etc.) so if we feed in something else, OSG will rescale it on the fly before registering it as an OpenGL texture.
Curtis L. Olson
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