[MERGE] Simple fix for "bzr log file"

[Robert Collins]

bb:comment

perhaps a overall simpler way would be to start generating the content
incrementally. Ignoring the merge_sort thing for now...

we have the merge sort list
we can walk the per-file graph from the tip rev being logged
each time we pass a depth 0 item in the merge sort, we have a 'batch' of
revisions that we know we'll want to output, so hand those over and
discard our memory of them.

[or something like that]

-Rob
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