[issue12916] Add inspect.splitdoc

[Martin Panter]

Martin Panter added the comment:

Uploading issue12916-splitdoc-5.patch:

* Documented TypeError
* Added stacklevel=2 to warning
* Test improvements
* Dropped the test for pydoc.splitdoc() removal

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Added file: http://bugs.python.org/file37956/issue12916-splitdoc-5.patch

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<http://bugs.python.org/issue12916>
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