[MERGE] Implement and use Repository.iter_files_bytes

[Aaron Bentley]

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Hi all,

This bundle implements a new interface for getting file contents:

Tree and Repository.iter_files_bytes.

It will be highly efficient on pack repos, requiring a single readv to
extract all desired texts.  This should greatly improve build_tree
performance.  It currently is a negligible improvement for knits.

This patch also changes build_tree and revert to use Tree.iter_files_bytes.

I propose merging this now, to reduce code divergence between Robert's
branch and the mainline.

Aaron
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