Merge libraries.htm update.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84504 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merge config from Trunk - previous merge was incomplete.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84505 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merge [84506] from trunk: Document that constructors initialize enable_shared_from_this. Fixes #8573.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84507 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merge iostreams to release.

Might as well merge now that the dependencies (BOOST_FALLTHROUGH support
and the new version of Boost.Build) are in release.


git-svn-id: http://svn.boost.org/svn/boost/branches/release@84508 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merged BOOST_TEST_THROWS from trunk, as it's been working fine for two months

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84519 b8fc166d-592f-0410-95f2-cb63ce0dd405