merged [85208] from trunk

git-svn-id: http://svn.boost.org/svn/boost/branches/release@85223 b8fc166d-592f-0410-95f2-cb63ce0dd405
merged [85209] from trunk

git-svn-id: http://svn.boost.org/svn/boost/branches/release@85224 b8fc166d-592f-0410-95f2-cb63ce0dd405
merged [85225] from trunk

git-svn-id: http://svn.boost.org/svn/boost/branches/release@85227 b8fc166d-592f-0410-95f2-cb63ce0dd405
merged [85226] from trunk

git-svn-id: http://svn.boost.org/svn/boost/branches/release@85228 b8fc166d-592f-0410-95f2-cb63ce0dd405