[MERGE] Bug #122656: better error message for bzr ann 'doesn't exist'

[Aaron Bentley]

Aaron Bentley has voted -0.
Status is now: Waiting
Comment:
Path should be relative to cwd.  Indenting should be four spaces.  Also, 
it looks like you could use errors.NotVersionedError, rather than 
writing up new error text.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20070628191258.4B06E2900A2%40twitch%3E