/brz/remove-bazaar

To get this branch, use:
bzr branch http://gegoxaren.bato24.eu/bzr/brz/remove-bazaar
0.17.1 by Robert Collins
Starting point. Interface tests hooked up and failing.
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Todo for groupcompress:
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 * layers - gc reader/writer and vf layers should be separate
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 * mpdiff usage
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 * other stuff from design
0.17.23 by Robert Collins
Only decompress as much of the zlib data as is needed to read the text recipe.
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 * use byte offsets not line offsets.