planet_color

There seems to be a problem with entering values for:
- case 02 (decimal numbers don't do anything for this)
- case 03 (no effect at all)

Example:
case 01: planet_color
case 02: 0.4 0 0
case 03: 0 0 0
case 04: 0.1
case 05: 1.6
case 06: 1.22

results in dull gray atmosphere