nested trees design-approach : composite trees vs iter_changes

[Aaron Bentley]

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Martin Pool wrote:
> I'd like a clear enhancement-proposal document describing the user
> cases for nested trees, the formats and the api changes that enable
> them, before we go any further with these code reviews or merging
> them.

> Ian agrees this would be useful and said he'd start drafting one based
> on his understanding of the patches he's read so far.  Aaron, I would
> ask you to pick it up from Ian and I hope it will be an easier way
> forward for this feature that we all want to see finished.

I didn't see anything from Ian, so I've updated NestedTreesDesign.
Input welcome.

Aaron
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