This is almost 'perfect' :-)
Still a bit of artifacts visible, but not much.
Essentially, what I have changed since the preceding render are:
increasing nearest_count to 10
increasing error_bound at 0.5 in the first pass
increasing low_error_factor to 0.9
increasing count to 250
decreasing recursion_limit to 2
decreasing brightness to 0.8 in the second pass

...and I gained a couple of hours at the first pass! So I can use that to 
increase count even more.

Again, many thanks to all for your very helpful comments!!
People! listen carefully to your betters!!!  :-)

Thomas

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