Adding the sun to image based lighting environment

Hi!

lum_sun source sun
-rx 90 -rz 8 -ry 0

0

4 0.6410 0.5537 -0.5315 0.5323

Does this pass oconv without error messages? I think you just need to
remove everything in the second line except the zero here, so it becomes

lum_sun source sun
0
0
4 0.6410 0.5537 -0.5315 0.5323

Cheers, Lars.