Blocked revisions 87840 via svnmerge

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  r87840 | r.david.murray | 2011-01-07 18:25:30 -0500 (Fri, 07 Jan 2011) | 6 lines

  #10686: recode non-ASCII headers to 'unknown-8bit' instead of ?s.

  This applies only when generating strings from non-RFC compliant binary
  input; it makes the existing recoding behavior more consistent (ie:
  now no data is lost when recoding).
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