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Pickling exceptions fails when an Exception class
requires an argument in the constructor, but doesn't
call its base class' constructor. See this mail
for details:
http://mail.python.org/pipermail/python-dev/2007-April/072416.html
This patch simply moves initial args assignment to
BaseException.__new__. This should fix most of the
problems, because it is very unlikely that an
exception overwrites the __new__ method; exceptions
used to be old style classes, which don't support
the __new__ special method.
The args attribute is still overwritten in all the
__init__ methods, so there shouldn't be any backward
compatibility problems.