[MERGE] Raise NoSuchRevision from fetch, instead of InstallFailed

[Andrew Bennetts]

Jonathan Lange wrote:
> On Fri, May 1, 2009 at 11:15 PM, Aaron Bentley <aaron at aaronbentley.com> wrote:
[...]
> > It removes a public symbol, so it's an API break.  It should be noted in
> > NEWS, and we should update the min_api_version.
> 
> I did note it in NEWS, but the min_api_version still needs updating.

I've just sent a trivial patch to PQM to do this.

-Andrew.