[MERGE] Nested trees: CompositeTree

[Aaron Bentley]

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Ian Clatworthy wrote:
> Aaron Bentley wrote:
> 
>> To an extent, this code is a work-in-progress, but it does pass all
>> tests, even with the later threads merged in, so I think it's ready for
>> review.
> 
> There's a lot here to digest and it taking me time. Here's a
> work-in-progress review.

Thanks for your review.  I'm working on a complete response, but your
comments have drawn me to re-evaluate the caching, so it's taking a bit
longer.

Aaron
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