Nested trees support

[Aaron Bentley]

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Wouter van Heyst wrote:
> I can't give an estimate, there has been no progress from my end for
> months. I have started on it again this week, but I make no promises.
> People wanting to look at the code, try it out, etc are welcome.

I will be working on nested trees during work time in the near future.
We should talk.

Aaron
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