Final update: For those interested, please find attached the final version of
this image, properly anti-aliased. I managed to get the rendering time down to
acceptable levels (2400x3600 in just under 24 hours). Two things did the trick.
The use of a light_group to avoid using an area light for the top part of the
image resulted in a significant speed up. Secondly, I noticed that I had been
using non-default anti-aliasing settings. I cannot remember changing it, but
restoring the threshold from 0.1 to 0.3 really helped, especially the parts of
the scene where rendering had slowed down to a crawl.

Once again thanks for all suggestions. These definitely helped to improve the
image.

Cheers,
Erwin

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