[MERGE/RFC] MemoryTree and a TreeBuilder helper

[Aaron Bentley]

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Robert Collins wrote:
> This sounds ok, though I'd be happier with 'focus on 2, and as changes
> to 1 are made keep the current behaviour by introducing a stance'.

The current behaviour is thoroughly broken.  When the kind is changed,
commits are usually permitted, but the change is not recorded.

> That stance could be 'dont allow via the ui at all' to start with. Just
> me being cautious, and /only/ a preference.

I'll give this some more thought.  Right now, my preference here is to
just make it easy for users to do what they want.  I don't think they'll
thank us if we forbid kind changes, even that small percentage who would
otherwise commit a file => directory change by mistake.

Aaron
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