[issue4395] Document auto __ne__ generation; provide a use case for non-trivial __ne__

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +docs at python -georg.brandl
stage:  -> needs patch
type:  -> behavior
versions: +Python 3.2

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<http://bugs.python.org/issue4395>
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