Merge hash from trunk.

- Avoid `-Wconversion` warnings.


[SVN r67664]

doc/Jamfile.v2

@@ -3,6 +3,9 @@
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+using boostbook ;
+using quickbook ;
+
 xml hash : hash.qbk ;
 boostbook standalone : hash :
     <xsl:param>boost.root=../../../..

doc/changes.qbk

@@ -119,4 +119,8 @@
   it's opt-in for now. This, or something like it, will become the
   default in a future version.
 
+[h2 Boost 1.46.0]
+
+* Avoid warning due with gcc's `-Wconversion` flag.
+
 [endsect]