todo before 0.4:
- make ListBranchingScheme() reconstructable from a string

todo:
- BzrDir.create_branch() should set the revision id to NULL_REVISION
- fix reuse of listbranchingscheme
- avoid extra connect in logwalker?
- free memory! (#54253)
- more blackbox tests
 - svn-import without scheme specified should guess
- transform file ids in workingtree in svn-upgrade
- support tags (#81102)
- more efficient implementation of get_revision_delta() to speed up bzr log -v
- nestedtree support

.svn working trees:
- implement apply_inventory_delta()
- support merge without requiring revisions to be added to svn repository
- add tests for objects returned by WorkingTree.pull(), Branch.pull()
- don't update all entries to the same revnum when opening working tree
- when committing specific files in a lightweight checkout, make sure to 
  also commit the file property changes for the tree root
- faster "bzr status"

for other things to do, see:

* https://bugs.launchpad.net/bzr-svn