fresh copy of repository for proto v4 development

svn path=/branches/proto/v4/boost/accumulators/; revision=44395
merged from trunk

svn path=/branches/proto/v4/boost/accumulators/; revision=45842
merged from trunk

svn path=/branches/proto/v4/boost/accumulators/; revision=47983
merged from trunk

svn path=/branches/proto/v4/boost/accumulators/; revision=49439
merged from trunk

svn path=/branches/proto/v4/libs/accumulators/; revision=49607