Create a development branch for the hash library.

svn path=/branches/hash/boost/io/; revision=38869
Initialise svnmerge for the hash branch.

svn path=/branches/hash/boost/io_fwd.hpp; revision=39015
Merge from trunk.

svn path=/branches/hash/boost/io_fwd.hpp; revision=39016
Merge from trunk.

svn path=/branches/hash/libs/io/; revision=39287
Merge with the offending files removed.

svn path=/branches/hash/boost/io_fwd.hpp; revision=39995
Another merge.

svn path=/branches/hash/boost/io_fwd.hpp; revision=40001
Merge from trunk.

svn path=/branches/hash/boost/io_fwd.hpp; revision=40260
Merge from trunk. Including floating point hash tweaks.

svn path=/branches/hash/boost/io/; revision=40266