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

[Serhiy Storchaka]

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


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dependencies: +Add support of UnicodeTranslateError in standard error handlers

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