[issue7713] implement ability to disable automatic search path additions

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +eric.araujo
stage: unit test needed -> needs patch
versions:  -Python 2.6, Python 2.7, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7713>
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