Merged revisions 60441-60474 via svnmerge from

Merged revisions 60441-60474 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r60441 | christian.heimes | 2008-01-30 12:46:00 +0100 (Wed, 30 Jan 2008) | 1 line

  Removed unused var
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  r60448 | christian.heimes | 2008-01-30 18:21:22 +0100 (Wed, 30 Jan 2008) | 1 line

  Fixed some references leaks in sys.
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  r60450 | christian.heimes | 2008-01-30 19:58:29 +0100 (Wed, 30 Jan 2008) | 1 line

  The previous change was causing a segfault after multiple calls to Py_Initialize() and Py_Finalize().
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  r60463 | raymond.hettinger | 2008-01-30 23:17:31 +0100 (Wed, 30 Jan 2008) | 1 line

  Update itertool recipes
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  r60464 | christian.heimes | 2008-01-30 23:54:18 +0100 (Wed, 30 Jan 2008) | 1 line

  Bug #1234: Fixed semaphore errors on AIX 5.2
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  r60469 | raymond.hettinger | 2008-01-31 02:38:15 +0100 (Thu, 31 Jan 2008) | 6 lines

  Fix defect in __ixor__ which would get the wrong
  answer if the input iterable had a duplicate element
  (two calls to toggle() reverse each other).  Borrow
  the correct code from sets.py.
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  r60470 | raymond.hettinger | 2008-01-31 02:42:11 +0100 (Thu, 31 Jan 2008) | 1 line

  Missing return
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  r60471 | jeffrey.yasskin | 2008-01-31 08:44:11 +0100 (Thu, 31 Jan 2008) | 4 lines

  Added more documentation on how mixed-mode arithmetic should be implemented. I
  also noticed and fixed a bug in Rational's forward operators (they were
  claiming all instances of numbers.Rational instead of just the concrete types).
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