[MERGE] Quick hack to do batching in InterDifferingSerializer. Almost halves the HPSS round-trips fetching pack-0.92-subtree to 1.9-rich-root.

[Robert Collins]

On Tue, 2008-11-18 at 10:56 -0500, Aaron Bentley wrote:
> Aaron Bentley has voted comment.
> Status is now: Semi-approved
> Comment:
> Looks pretty good.  The only question I have is: Are we sure that 
> loading 100 trees simultaneously won't use insane amounts of memory on 
> large trees?

100 is the average knit chain length for inventory text deltas, the
single largest object being loaded; all the texts lines should be
shared, and only one xml is parsed at a time. (Well 2, for diffing, but
one from the iterator).

-Rob
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