[docs] [issue18576] Rename and document test.script_helper as test.support.script_helper

[Fotis Koutoulakis]

Fotis Koutoulakis added the comment:

Taking the feedback during code review, this is a patch that has the points raised by Serhiy Storchaka fixed.

As always, please do note omission or mistakes from my part. Thanks for your help.

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Added file: http://bugs.python.org/file33057/issue18576_third_try.patch

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