[MERGE] 'bzr dump-btree'

[John Arbash Meinel]

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This adds a new hidden command "dump-btree". The really great thing
about btree indexes is that they are compressed, so you can fit lots of
info in a small space. The really bad thing is that they are compressed,
so you can't just open them up in a text editor and see what is there.

So I'm adding a command "bzr dump-btree [--raw]". In normal mode, it
spits out the tuples that the btree contains. In '--raw' mode, it just
decompresses the bytes and spits them out directly. With a tiny amount
of extra info to declare where the pages start.

I also find this useful when debugging the "pack-names" file, as I've
frequently read it to figure out what pack files are actually referenced
(since you can get some cruft in your packs/* directory).

John
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