Unless I'm completely mistaken about what to expect, it seems that turbulence
does not work at all when used in plain fog, even though it's supposed to.

In POV-Ray's demo scenes (scenes/interior/) there are two fog files, 'foglayr'
and 'foglyr2'. Run either one of those, and wildly increase the turbulence
amounts. There is still no turbulence that I can see. Tested in the latest
3.8.0-alpha and in 3.7.1-beta9

BTW, warp{turbulence...} doesn't work in fog either; it throws a fatal error.

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