[RFC] executable on windows

[Aaron Bentley]

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Hi all,

On Windows, executing 'bzr' causes 'bzr.py' to be run.  On *nix, it
causes 'bzr' to be run.

To accomodate both styles, I propose we rename bzr to bzr.py and create
a new bzr that simply invokes bzr.py.

Thoughts?

Aaron
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