Merge latest changes from trunk.
Merged revisions 44616-44702 via svnmerge from https://svn.boost.org/svn/boost/trunk
........
r44650 | danieljames | 2008-04-20 22:08:57 +0100 (Sun, 20 Apr 2008) | 1 line
Update an include.
r44697 | danieljames | 2008-04-21 16:55:40 +0100 (Mon, 21 Apr 2008) | 1 line
Factor out the code for choosing the bucket count, and which bucket that hash values map to make it easier to experiment with alternative policies.