[MERGE] (0.17) reworked LogFormatter API

[Kent Gibson]

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>
> The fact that John misread it your way suggests it doesn't read
> very well ;)
>
> FWIW, I also find "getattr(lf, 'log_revision', None) is None" over
> "not ..." to be slightly clearer.  Negations tend to be confusing
> for humans.
They are not.


Cheers,
Kent.
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