[MERGE] Tree.get_matching_blocks

[Aaron Bentley]

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Hi all,

This patch implements Tree.get_matching_blocks, which is a targeted API
for high-performance bzr diff.

Tree.get_matching_blocks will be implemented on top of a cache for
comparison with the basis.  For historical trees, it will be derived
from content deltas.

In addition to "diff" it can also speed up merge and commit.

Aaron
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