Blocked revisions 73459,73563 via svnmerge

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  r73459 | raymond.hettinger | 2009-06-16 20:43:47 -0500 (Tue, 16 Jun 2009) | 1 line

  Add usage note.
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  r73563 | amaury.forgeotdarc | 2009-06-25 16:29:32 -0500 (Thu, 25 Jun 2009) | 2 lines

  Fix a compilation warning on Windows
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