Baz-import now does repositories, better Arch translation

[Aaron Bentley]

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Hi all,

I've just merged some significant changes to baz-import, mostly work
done by Robert Collins.  As a result, baz-import now translates merge
data into the correct bzr equivalent.

If you have been using the special bzrtools-baz2bzr branches, this
merely moves that functionality into the mainline.  If you were
previously using the bzrtools mainline, this new version is not
compatible with previous imports.  (However, that should only matter if
you're doing incremental conversions, or if someone else does their own
conversion of the same Arch/Baz branch, and you want to merge them.)

The baz-import command now converts entire Arch archives (or subsets
that you specify) into bzr repositories.  You can still import single
branches as standalone trees; to do that, use baz-import-branch.

To do a complete run of the bzrtools test suite, it's now necessary to
install testresources: http://www.robertcollins.net/unittest/testresources/

Aaron
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