Too few colors on cube sides in view_cube

[tboggs]

Only a few, discrete colors are displayed on the side of the cube now. This is due to commit d54d13f , which changed the default ColorScale to only use the given colors (i.e., no interpolation). This can be fixed by creating a new color scale in HypercubeWindow.load_textures that uses 256 colors, which is what the previous default color scale used to provide.