Imported Launchpad into a shared repository

[David Allouche]

Thanks to LocalTransport.list_dir fix I just posted, plus Robert's knit
performance patch (the actually needed bit is a trivial one-liner in
repository.py), both applied on top of the latest bzr.dev, I was able to
put a Launchpad branch into a bzr repository.

For people willing to experiment, the recipe is:

Apply the two attached patches to bzr.dev r1574. Robert tells me the
important (for that problem) bit in the knit-performance-1 patch is the
hunk in repository.py that reads:

-            done.add(result)
+            done.add(revision_id)

Create an empty directory that will be used as the repository root.
cd into that directory.
Run "PYTHONPATH=path/to/bzr/checkout python.

from bzrlib import bzrdir
d = bzrdir.BzrDirMetaFormat1().initialize('.')
r = d.create_repository(shared=True)

bzr clone launchpad launchpad-metadir
cd launchpad-metadir
bzr upgrade --format=metadir
bzr clone . ../repo/launchpad
-- 
                                                            -- ddaa
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