Misc stuff

[Aaron Bentley]

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There's redundant code in the implementation of bzr pull:

        from bzrlib.branch import DivergedBranches
        br_from = find_branch(location)
        location = pull_loc(br_from)
        old_revno = br_to.revno()
        try:
            from branch import find_cached_branch, DivergedBranches
            br_from = find_cached_branch(location, cache_root, local_ref)
            location = pull_loc(br_from)
            old_revno = br_to.revno()
            try:

I think this was a bad merge.

Also, wouldn't it make sense for ImmutableStore.__getitem__ to throw
KeyError if it doesn't have an item, instead of throwing an IOError?

And can we call it something else, like FilesystemStore?  It's not
really immutable, anyway.  More like set-once.

Also, due to the restructuring, ^C no longer clears the progress bar
automatically.

Aaron
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