[MERGE][Bug #64783] Fixing check to understand the split-up .bzr format

[Martin Pool]

Martin Pool has voted resubmit.
Status is now: Resubmit
Comment:
Thanks for this, it's very useful to fix this bug.

You seem to be removing the check.check() api?  That should at least be 
documented, or better yet left behind and deprecated.

_get_elements() is useful, though seems like it should be in a more 
general location.  Doesn't info do (or need) something very similar? 
And I am not so sure it should be checking the paths against '.' in 
particular.  If this is factored out it could be tested.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20080310235632.45375f02%40lapbert.oxbridgetech%3E