PyPy and bzr

[vila]

Hey ! Hi Larstiq ! Nice to see you back :)

Thanks for working on this.

<snip/>

    > Before I fall asleep, I put up https://code.launchpad.net/~larstiq/bzr/bzr-pypy
    > which makes the export and test_pack blackbox tests pass on pypy.

I turned it into a merge proposal:
https://code.launchpad.net/~larstiq/bzr/bzr-pypy/+merge/60986

Feel free to push additional changes to this branch, the diff will be
updated accordingly.

        Vincent