[issue6300] encode and decode should accept 'errors' as a keyword argument

[Amaury Forgeot d'Arc]

Changes by Amaury Forgeot d'Arc <amauryfa at gmail.com>:


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keywords: +easy
stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6300>
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