reintroducing root ids

[Robert Collins]

So, two concepts now - repo scaling and nested trees have +1s on using
root ids.


Now we need an algorithm to sanely introduce them to existing trees, and
generate them in new trees.

I kinda like Aarons 'add them when you commit with the parent being the
NULL_REVISION' concept.


Related to this is the root id to use in arch conversions - if you
convert two related branches independently we should end up with the
same root id.


I dont have a proposal to make, other than that we figure this out :)

Rob


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