[plugin] dirstate experiments

[Aaron Bentley]

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John Arbash Meinel wrote:
> At this point I'm running into the time it takes to do 60k additions,
> and 20k list.appends().
> So I don't think there is much more room for improvement.

Here's a thought for the update-single-entry case:
The file could end with an unsorted, append-only portion, whose values
overrode the values in the main section.

This would allow us to update single entries with the moral equivalent
of: file('dirstate', 'ab').write('my new values')

Obviously, we'd want to re-sort the file fairly often, because a large
append-only section would hurt performance.

Aaron
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