Merged revisions 69078-69080 via svnmerge from

Merged revisions 69078-69080 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r69078 | brett.cannon | 2009-01-28 16:54:11 -0800 (Wed, 28 Jan 2009) | 2 lines

  Clarify some __del__ stuff.
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  r69079 | brett.cannon | 2009-01-28 16:54:32 -0800 (Wed, 28 Jan 2009) | 2 lines

  Minor spelling mistake in datetime docs.
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  r69080 | brett.cannon | 2009-01-28 16:55:33 -0800 (Wed, 28 Jan 2009) | 2 lines

  Ignore .pyc and .pyo files.
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