[MERGE] slightly better error when detecting gzip corruption

[John Arbash Meinel]

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A while back we had someone who started getting some disk corruption of
their Knit files. This showed up as just getting

bzr: ERROR: Not a gzipped file

Which wasn't really helpful, because it couldn't pinpoint where the
actual error was (what knit file, what version, etc.)

I had a version of this patch lying around as part of trying to debug
it. So I figured I'd clean it up, add some tests, and submit it.

Also it changes an integrity check from being an 'assert' to being a
real if (): raise. Since the assert won't be checked if someone uses the
- -O flag.


John
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