[MERGE/RFC] Reconcile now rewrites inventory sha1sums

[Aaron Bentley]

John Arbash Meinel wrote:
> John Arbash Meinel has voted comment.
> Status is now: Conditionally approved
> Comment:
> Aaron, do you remember what this was blocking on?

It was blocking on removing the functionality for rewriting pre-knit
formats.

> It seems like it would
> be nice to get this in soon so we can recommend a "XX-rich-root" as the
> default format.

Yes.  Unfortunately, it's got conflicts all over the place.

Aaron