Create a development branch for the hash library.

svn path=/branches/hash/boost.css; revision=38869
Merge from trunk.

svn path=; revision=39016
Merge from trunk.

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

svn path=; revision=39995
Another merge.

svn path=; revision=40001
Merge from trunk.

svn path=; revision=40260
Merge from trunk. Including floating point hash tweaks.

svn path=; revision=40266