verify: report first bad changeset - add linkrev and file arguments to err - track lowest reported linkrev in err - find linkrev in a couple cases - sort linkrevs when reporting a bunch of errors against a file - tidy up lots of messages - make more robust against damaged indexes - report first bad changeset if an error is encountered

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adding a

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Now at: a.patch

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applying b.patch

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applying c.patch

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Now at: c.patch

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Now at: b.patch