check improvements

[Robert Collins]

I'm working on check at the moment. Its a routine users will be called
upon to run from time to time, and its O(Revs*trees) at the moment; not
a good mix.

So far I've made a bunch of small cleanups as I refresh my memory of the
code and also start removing duplication.

I'm not planning on sending in incremental patches, because I'm not
expecting a great deal of stability - new code would be reviewed only to
be replaced.

However, I have cleaned up the UI already and if folk want to test my
new stuff its at: lp:~lifeless/bzr/.

Feedback appreciated.

Cheers,
Rob

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