updates for fusion 2.1

svn path=/branches/fusion/2_1/boost/xpressive/; revision=40247
updates for fusion 2.1

svn path=/branches/fusion/2_1/libs/xpressive/; revision=40248
updates

svn path=/branches/fusion/2_1/libs/xpressive/; revision=40386
updates

svn path=/branches/fusion/2_1/boost/xpressive/; revision=40387