[MERGE] revert DIRECTORY works recursively

[Aaron Bentley]

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Hi all,

This patch makes revert DIRECTORY work recursively.  Previously, it had
only reverted the directory itself, which differs from other bzr
commands and isn't terribly useful.

The recursion takes a maximally-inclusive approach.  That is, if a
directory is reverted, all its children in the working tree and all its
children in the basis tree are reverted.  The same applies to any
directories among the children, and so on.

Aaron
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