[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

There were two incorrect tests in float_pow_testcases.patch:

+            self.assertEqualAndEqualSign(pow_op(-INF, -0.5), -0.0)
+            self.assertEqualAndEqualSign(pow_op(-INF, -2.0), -0.0)

these should both have had 0.0 in place of -0.0.  Here are corrected and 
slightly expanded tests;  I've also fixed an incorrect doctest (0**nan 
should be nan, not 0) in Lib/test/ieee754.txt.

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Added file: http://bugs.python.org/file15610/float_pow_testcases2.patch

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