debugindex: add --format flag to allow debugging parentdelta -f 1 shows extra data from revlogv1 (aka revlogng) including flags and size (based on a patch by Pradeepkumar Gayam <in3xes@gmail.com>)

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http://mercurial.selenic.com/bts/issue433

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  $ hg init

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  $ echo a > a

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  $ hg commit -Ama

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  adding a

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  $ hg parents -r 0 doesnotexist

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  abort: 'doesnotexist' not found in manifest!

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