[MERGE (0.12)] Bundle format 0.9

[Aaron Bentley]

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Hi all,

This patch introduces support for bundle format 0.9 and testament format
3 strict.

The only thing new about these formats is that they support rich root
metadata.  However, they can also be used for old revisions whose root
metadata is not rich.

This patch also includes my parent_check patch, because partway through
this work, I discovered my knits were being silently corrupted, and
wrote the patch.

I believe these two formats are the last ones that need bumping, and
once this is merged, I can go back to making root ids unique.

Aaron
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