[HDRI] Universal version of Photosphere ready

[Axel Jacobs]

> Sorry, "Universal" is probably a misnomer, but it isn't my
> misnomer...

I know, I know. Just winding you up...

> It would be great if I had a Linux version, and maybe at
> some point I will.  I just need someone to do the port to a system-
> independent GUI library (like WxWidgets or Qt), then we'll have a
> common base that works for Windows, Linux, and OS X.  Wouldn't be a
> bad idea for Radiance's rvu program, either...

Looking forward to this day.

Axel