[CHANGE #298] adapt navslices and marching cubes to the new threshold
behavior. On this way a couple of other things have been fixed: * use only 8 textures because the compiler told me "undefined variable "gl_MultiTexCoord8"" * simplified highlighting of picked slices as they have the correct size for some time now * removed some commented useless code * fixed the problem that isosurfaces could show only one texture * simplified calling of renderSurface function in marching cubes module
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