Blocked revisions 72692-72694 via svnmerge

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  r72692 | benjamin.peterson | 2009-05-16 17:30:48 -0500 (Sat, 16 May 2009) | 1 line

  deal with old-style classes in issubclass and isinstance
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  r72693 | benjamin.peterson | 2009-05-16 17:40:56 -0500 (Sat, 16 May 2009) | 1 line

  completely ignore old-style stuff for type checking overloading
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  r72694 | benjamin.peterson | 2009-05-16 17:46:11 -0500 (Sat, 16 May 2009) | 1 line

  update
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