Set Slope surface bumps for Ldview Pov-ray export

[Travis Cobbs]

If you look at the color definition code inside the POV file that LDView creates, you will see that it surrounds each color definition inside a block saying #ifndef <ColorName>. Because of this, it will use the definition from your include file (as long as you carefully give it the same name), and ignore the definition inside the POV file generated by LDView. If the #ifndef statement weren't there, it would probably use the version in the file and ignore your definition. I don't remember enough about POV code, though; it might instead generate an error when the color was redefined. I do suspect that even if it didn't generate an error, it would generate a warning.