fresh copy of repository for proto v4 development

svn path=/branches/proto/v4/boost/numeric/interval.hpp; revision=44395
merged from trunk

svn path=/branches/proto/v4/libs/numeric/interval/; revision=45230
merged from trunk

svn path=/branches/proto/v4/boost/numeric/interval/; revision=47991
merged from trunk

svn path=/branches/proto/v4/boost/numeric/interval/; revision=48028
merged from trunk

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

svn path=/branches/proto/v4/libs/numeric/interval/; revision=49607