[MERGE] 'knit' repository format [to reduce size of versioned-file merge]

[Robert Collins]

This patch adds the new repository format and upgrade logic that will be
needed to activate knits when the versioned file merge is complete. It
adds the UI to upgrade to knits, the logic to convert repositories
within a meta-dir and matching tests.

Rob

$ wc -l new-repo-format.patch
1243 new-repo-format.patch
$ diffstat new-repo-format.patch 
 builtins.py                                                   |    6 
 bzrdir.py                                                     |  116 +-
 fetch.py                                                      |    2 
 repository.py                                                 |  497
+++++++---
 tests/blackbox/test_upgrade.py                                |   34 
 tests/branch_implementations/test_branch.py                   |   17 
 tests/bzrdir_implementations/test_bzrdir.py                   |   28 
 tests/interrepository_implementations/test_interrepository.py |   12 
 tests/repository_implementations/test_repository.py           |   24 
 tests/test_repository.py                                      |  109 ++
 tests/test_upgrade.py                                         |    2 
 11 files changed, 671 insertions(+), 176 deletions(-)

-- 
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