bug: ctrl-c during revision installation may be ignored

[Robert Collins]

Something in bzr has an overly broad except clause - I did a ctrl-c
during the revision pulling phase of a merge, which resulted in a
'failed to install revisionX' message, but the revision pulling
continuing.

As a general principal, we should never have a catch-all except clause
except where we also have either a raise (in this case a finally:
probably makes more sense), or a very very tightly constrained context.

Rob
-- 
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