reintroducing root ids

[Aaron Bentley]

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James Henstridge wrote:
> The problem with this is if two people perform parallel conversions
> with different sets of reachable baz-1.x branches they will get
> different root IDs.

Yep, it's got to be reproduceable.  But I don't know that it has to be
unique.  Maybe TREE_ROOT, even.

Aaron
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