[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Facundo Batista]

Facundo Batista added the comment:

The last patch (exception_pickling_26.diff) applies cleanly, and all the
tests run ok.

System:
  Python 2.6a0 (trunk:60073M, Jan 19 2008, 11:41:33) 
  [GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2

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nosy: +facundobatista

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<http://bugs.python.org/issue1692335>
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