[MERGE] Implement a proper PreviewTree.path_content_summary

[Aaron Bentley]

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Aaron Bentley wrote:
> Hi all,
> 
> This patch builds on my other patches by implementing
> path_content_summary for PreviewTree.  It builds on my previous submission:
> http://bundlebuggy.aaronbentley.com/request/%3C4861668F.60208@aaronbentley.com%3E

Unfortunately, that means it's also affected by the path2id improvement.
 Here's a fresh version.

Aaron
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