Does anyone know whether it is possible for a scene file to detect 
whether or not it is being rendered by UberPOV, without bombing out if 
it is rendered by official POV-Ray?

Why would I need to do this?  Because I'm writing a macro that needs to 
know whether or not true inverse square light attenuation is available. 
For official POV-Ray, this is version >= 3.8, but for UberPOV, it is 
version >= 3.71.

My first (and so far only) idea was to start with a test for the 
existence of the variable 'unofficial', but it turns out POV-Ray 3.8 
does the same test--but treats it as if it were a keyword.  This screws 
up the test for any SDL code running under 3.8.

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