[issue13857] Add textwrap.indent() as counterpart to textwrap.dedent()

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I created #14957 to cover improving the str.splitlines docs.

For this patch, I think Chris is right that it should be using str.splitlines(True) and joining on "''" instead of "'\n'" so that Windows line endings get preserved.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13857>
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