[MERGE] make bzr script un-importable

[Benjamin Peterson]

Hi Bazaar Developers,
I was reading through Bazaar's source, and I noticed these lines in the main
bzr script:
if __name__ == "__main__":
    # run bzr
else:
    pass    # should this give an error? - it can't be used as a lib
This bundle makes importing the bzr script raise an ImportError.

Thanks for you comments,
Benjamin Peterson
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