StGIT experimental branch updated

I've rebased my experimental branch against the stuff Catalin pushed out recently. The remaining diff is mostly the DAG series and David's push conflict improvements. I haven't had time to test drive it thoroughly, but it passes the test suite.

The following changes since commit 7e97cc0590f29482af022340df84a43b98c657ce:
  Yann Dirson (1):
        Include contrib scripts in the release tarball.

are available in the git repository at:

  git://repo.or.cz/stgit/kha.git master

David Kågedal (5):
      Split git.merge into two functions
      Leave working dir and index alone after failed (conflicting) push
      Added a test case to check what happens when push finds a conflict
      Simplify merge_recursive
      Use the output from merge-recursive to list conflicts

Karl Hasselström (12):
      Compute patch appliedness from commit DAG
      Test the new DAG appliedness machinery
      Fix bash completion after the DAG appliedness patch
      Speed up the appliedness test
      Speed up the discovery of uninteresting commits
      Speed up appliedness check during patch creation
      Don't traverse the whole DAG when looking for uninteresting commits
      Find uninteresting commits faster for special cases
      Optimize uninterestingness checks for rebase
      Don't touch ref files manually
      Merge branch 'refs'
      Merge branch 'conflict'

 contrib/stgit-completion.bash |   15 +-
 stgit/commands/branch.py      |    5 +-
 stgit/commands/commit.py      |    8 +-
 stgit/commands/common.py      |    4 +-
 stgit/commands/float.py       |    2 +-
 stgit/commands/imprt.py       |    2 +-
 stgit/commands/pick.py        |    2 +-
 stgit/commands/refresh.py     |    2 +-
 stgit/commands/sync.py        |    2 +-
 stgit/git.py                  |  140 ++++++----
 stgit/stack.py                |  642 ++++++++++++++++++++++++++++++++---------
 t/t0001-subdir-branches.sh    |    7 +-
 t/t1000-branch-create.sh      |   30 +--
 t/t1001-branch-rename.sh      |    2 +-
 t/t1203-push-conflict.sh      |   64 ++++
 t/t3000-git-interop.sh        |   60 ++++
 t/t4000-upgrade.sh            |    6 +
 17 files changed, 741 insertions(+), 252 deletions(-)
 create mode 100755 t/t1203-push-conflict.sh
 create mode 100755 t/t3000-git-interop.sh