Create a development branch for the hash library.

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

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

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

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

svn path=/branches/hash/boost/xpressive/; revision=40260