[merge] remove uses of 'assert False' to raise an exception

[Robert Collins]

On Wed, 2007-06-27 at 14:37 +1000, Martin Pool wrote:
> There were some places in bzrlib where we said
> 
>   assert False, "something bad happened"
> 
> This is bad because assertions aren't run under python -O, and so the
> interpreter would run on regardless of what was meant to be a fatal
> problem.  Also in most cases there was a more useful exception we can
> raise instead.
> 
> python -O is not very interesting or commonly used at the moment, but
> I had a note to clean them up.

+1
-Rob
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