Merged revisions 63724 via svnmerge from

https://svn.boost.org/svn/boost/trunk

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  r63724 | eric_niebler | 2010-07-07 11:55:56 -0400 (Wed, 07 Jul 2010) | 1 line
  
  add missing include to docs for covariance
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[SVN r63727]

libs/accumulators

@@ -1 +1 @@
-Subproject commit fb804cdf7dad1735f5d8e0a5359df18c40ec24ff
+Subproject commit 0fcb5cc03b9a6cee95d10b460d398d1c86470481