[MERGE] fix bzr log --short and add a test

[John Arbash Meinel]

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Ian Clatworthy wrote:
> Ian Clatworthy has voted tweak.
> Status is now: Conditionally approved
> Comment:
> The core fix has been applied to bzr.dev. linear_view_revisions() needs
> to stay. The test is good (and needs merging into bzr.dev).
> 


I would really like the code to evolve so that _linear_view_revisions is
not necessary. (By changes like making _mainline_revs become an
iterator, etc.)

But for now I'll go along with it, since there are still benefits to be had.

John
=:->
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