[MERGE] BzrDir.destroy_workingtree

[Aaron Bentley]

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We need a way to destroy working trees without destroying their
branches, for at least two purposes:
1. removing the working trees in repositories
2. implementing nested-by-value trees

BzrDir supports creating workingtrees, and opening them once created.
So it seems consistent to destroy them that way, too.

What I'm implementing for nested-by-value trees is a 'join' command,
which converts a subtree into part of the larger tree, while preserving
history and setting parent_ids.  As part of the conversion, the subtree
checkout metadata is deleted, while the file contents and branch are
retained.

Aaron
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