[loggerhead/MERGE] Fix deprecated methods in bzrlib

[Michael Hudson]

Martin Albisetti wrote:
> This patch replaces all deprecated methods in bzrlib, which get
> triggered in generating the revision graph, and annotation view.

I think this is mostly fine.  I've made a few trivial whitespace changes 
(diff attached) but otherwise I'm happy with it.

Out of interest, do you know what the oldest version of bzr that this 
will work with is?

Cheers,
mwh


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