[MERGE] Support for tbzr c++ implemented shell extension

[Mark Hammond]

Tortoise has recently pushed a C++ implementation of the Shell Extension 
which is able to fully replace the current Python implemented one. 
Advantages include 64bit support and reduction in overhead for processes 
which drag in shell extensions.

The attached patch modifies setup.py and bzr.iss.cog accordingly.

Cheers,

Mark
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