[MERGE][Bug #209948][1.4] properly skip over ghosts when displaying the changes for a single file.

[John Arbash Meinel]

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This was a small regression introduced with some changes to log. Basically, the
api assumed that there would be no ghosts. It now properly skips ghost nodes
when determining the revisions that modified a file.

The bug is marked as Critical for 1.4 (as it breaks all 'bzr log XXX' for
bzr.dev). The change is small enough that I don't think it will be a problem.

John
=:->

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