merge [76766] from trunk to release

svn path=/branches/release/boost/xpressive/; revision=79614
xpressive bug fixes merged from trunk: [79726], [79732], [79761], [79763], [79765], [79766], [79789]

svn path=/branches/release/boost/xpressive/; revision=79885
merge [80211] from trunk

svn path=/branches/release/libs/xpressive/; revision=80298
xpressive: merge [80300], [80312], [80357] from trunk

svn path=/branches/release/boost/xpressive/; revision=80581
comment typo, fixes #7554

svn path=/branches/release/libs/xpressive/; revision=81309
disable anoying msvc-11 warnings during tests

svn path=/branches/release/libs/xpressive/; revision=81312
merge [82103] from trunk, fixes #7809, permission from Marshall

svn path=/branches/release/boost/xpressive/; revision=82334
merge [82336] from trunk

svn path=/branches/release/boost/xpressive/; revision=82512
merge [82832] from trunk, fixes #8039

svn path=/branches/release/boost/xpressive/; revision=82961