Merged revisions 80439 via svnmerge from

Merged revisions 80439 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r80439 | brian.curtin | 2010-04-24 10:40:11 -0500 (Sat, 24 Apr 2010) | 6 lines

  Fix #7838. Add docstrings and privatize _subprocess implementation details.

  Since CREATE_NEW_* are used for the creation flags of a subprocess, they
  were added to __all__. The rest of the previously exposed attributes are
  now qualified by _subprocess.ATTR rather than importing *.
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