Merged revisions 77519,77530,77533 via svnmerge from

Merged revisions 77519,77530,77533 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r77519 | mark.dickinson | 2010-01-16 10:44:00 +0000 (Sat, 16 Jan 2010) | 5 lines

  Issue #7632: Fix a serious wrong output bug for string -> float conversion.
  Also remove some now unused variables, and add comments clarifying the
  possible outputs of the parsing section of _Py_dg_strtod.  Thanks
  Eric Smith for reviewing.
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  r77530 | mark.dickinson | 2010-01-16 17:57:49 +0000 (Sat, 16 Jan 2010) | 3 lines

  Issue #7632: Fix one more case of incorrect rounding for str -> float
  conversion (see bug 5 in the issue tracker).
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  r77533 | mark.dickinson | 2010-01-16 18:06:17 +0000 (Sat, 16 Jan 2010) | 1 line

  Fix multiple uses of variable 'L' in _Py_dg_strtod, where one use requires an unsigned long and the other a signed long.  See also r77421.
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