[issue18814] Add codecs.convert_surrogateescape to "clean" surrogate escaped strings

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Added file: http://bugs.python.org/file38520/codecs_convert_escapes_2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18814>
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