Radiance package ununstaller clobbers RAYPATH

[rpg777]

Hi Rob,

Awesome to see the new 64-bit version!

One thing I'd like to point out: the uninstaller from the old package seems to clobber the raypath for the new package. I'm not sure if this is an issue for many people; most don't have as many different Radiance installations as I have. However, it would be nice to make the uninstaller check that the raypath has been made empty before deleting it.

Cheers,

Nathaniel