Create a branch for documentation work.

svn path=/branches/doc/boost/optional.hpp; revision=44584
Fix some links in the optional docs. Refs #1687

svn path=/branches/doc/libs/optional/; revision=44592
Merge with trunk.

svn path=/branches/doc/boost/optional/; revision=44810
Remove my accidental changes to the optional jamfile.

svn path=/branches/doc/libs/optional/; revision=44811
Use root links in quickbook.

svn path=/branches/doc/libs/optional/; revision=45364