[MERGE] Redo annotate more simply, using just the public interfaces for VersionedFiles.

[Robert Collins]

On Mon, 2008-07-07 at 17:59 +1000, Martin Pool wrote:
> I added this additional patch to make test_annotate pass in the
> "named-nograph-knit-pack) case, where get_parents returns None as the
> parents of all requested revisions.
> 
> This patch is not quite satisfactory because it seems like a bit of a
> hack when the code is not being clear about just what should be
> expected in these values.  Feedback would be very welcome.

The None is returned when there is no graph actually stored. I feel its
cleaner not to invent parent lists that don't actually exist. As to this
specific fix - I don't know that we want to be doing bzrlib.graph
operations for a VersionedFile store that has no graph.

The test is just for completeness; we could equally say that a no-graph
versioned files should error on annotate().

-Rob

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