[rfc] [patch] small cleanups

[Aaron Bentley]

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Denys Duchier wrote:
> Here are 4 small fixes available from my bzr.cleanup branch:
> 
>              http://delta.univ-orleans.fr/~duchier/bzr/bzr.cleanup
> 
> revision 1500 is the trivial hashcache fix without the transaction extension
> (sniff... makes me sad).

Looks good.  Can we have a test that HashCache.get_sha1 can raise BzrError?

Otherwise, +1

Aaron
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