[issue15045] Make textwrap.dedent() consistent with str.splitlines(True) and str.strip()

[Zachary Ware]

Changes by Zachary Ware <zachary.ware at gmail.com>:


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versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15045>
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