[BUG] bzrdir work permits old formats to be opened for non-upgrade purposes

[Aaron Bentley]

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Using Robert's integration, BzrDir.open_containing will successfully
open format-4 branches.

$ bzr log
- ------------------------------------------------------------
revno: 804
committer: Aaron Bentley <abentley at panoramicfeedback.com>
timestamp: Tue 2005-06-28 10:23:55 -0400
message:
  Implemented failover store
bzr: ERROR: exceptions.AttributeError: 'Repository' object has no
attribute 'control_weaves'
  at /home/abentley/ab.integration/bzrlib/repository.py line 474
  in get_inventory_weave
$ cat .bzr/branch-format
Bazaar-NG branch, format 0.0.4
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