rich roots conversion

[John Arbash Meinel]

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Robert Collins wrote:
> So John, I'm blocked on organising a migration to rich roots for bzr
> pending the outcome of your discussion on changing the migration
> algorithm.
> 
> Was it pure speculation or something concrete you are working on?
> 
> -Rob

It was speculative based on

1) Observing that fully 1/5th of the text keys in the launchpad tree are
for the TREE_ROOT
2) 1/2 of the keys are for the empty-text, which was pretty surprising
3) Discussions with Aaron about why we were generating a new revision_id
on every revision seemed to boil down into wanting to handle 'ghosts',
only it isn't really handled anyway.

So it was mostly a feeling that the reason we were generating these
extra nodes seemed a bit bogus, and it means we carry that cruft around
for a long time.

John
=:->
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