[issue1691387] Call sys.except_hook if exception occurs in __del__

[Daniel Diniz]

Changes by Daniel Diniz <ajaksu at gmail.com>:


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stage:  -> test needed
versions: +Python 2.7, Python 3.1 -Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1691387>
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