Merge with trunk.

svn path=/branches/doc/boost/unordered/; revision=44810
Use root links in quickbook.

svn path=/branches/doc/libs/unordered/; revision=45364
Merge latest changes from unordered.

svn path=/branches/doc/boost/unordered/; revision=45892
Use both PNG and SVG versions of the buckets diagram.

svn path=/branches/doc/libs/unordered/; revision=46017
Improved function summary tables in unordered documenations.

svn path=/branches/doc/libs/unordered/; revision=46018
I'd hacked the bibliography to avoid showing the title twice, but this was
causing problems when generating PDFs, so show the title twice.

svn path=/branches/doc/libs/unordered/; revision=46019
Don't use the compact boostbook refernce style in the standalone documentation
as it is too wide for printing out.

svn path=/branches/doc/libs/unordered/; revision=46020