work around missing __isctype on some glibc implementations

svn path=/trunk/boost/xpressive/; revision=79789
turn off debug symbols on msvc

svn path=/trunk/libs/xpressive/; revision=80211
make sub_match work with boost.range, doc tweaks

svn path=/trunk/boost/xpressive/; revision=80300
fix erroneous use of BOOST_CONSTEXPR config macro

svn path=/trunk/boost/xpressive/; revision=80312
work around strange msvc bug

svn path=/trunk/boost/xpressive/; revision=80357
comment typo, refs #7554

svn path=/trunk/libs/xpressive/; revision=81153
disable anoying msvc-11 warnings during tests

svn path=/trunk/libs/xpressive/; revision=81154
accomodate recent changes to boost's smart pointers, refs #7809

svn path=/trunk/boost/xpressive/; revision=82103
make symbols test pass on gcc with -Wall

svn path=/trunk/boost/xpressive/; revision=82336
remove unused variables, refs #8039

svn path=/trunk/boost/xpressive/; revision=82832
avoid name clash with macro None in glx.h, refs #8204

svn path=/trunk/boost/xpressive/; revision=83303
silence a gcc warning, refs #8138

svn path=/trunk/boost/xpressive/; revision=83304