[issue1509798] replace dist/src/Tools/scripts/which.py with tmick's which

[Daniel Diniz]

Changes by Daniel Diniz <ajaksu at gmail.com>:


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components: +Demos and Tools -None
stage:  -> test needed
versions: +Python 2.7, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1509798>
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