Boost.Log merged to release.

svn path=/branches/release/boost/log/; revision=84333
Updated changelog, corrected comments.

svn path=/branches/release/libs/log/; revision=84336
Fixes #8585. Fixed typos in docs and comments.

svn path=/branches/release/libs/log/; revision=84352
Merge Boost.Build from the trunk.

svn path=/branches/release/boost/log/; revision=84398
Add type_erasure to release

svn path=/branches/release/libs/log/; revision=84399
Merge root index file.

svn path=/branches/release/libs/log/; revision=84413
Merge index note and redirect for type erasure.

svn path=/branches/release/boost/log/; revision=84438
Merge [81027] from the trunk.

svn path=/branches/release/boost/log/; revision=84442
Merge libraries.htm update.

svn path=/branches/release/libs/log/; revision=84504
Merge [84506] from trunk: Document that constructors initialize enable_shared_from_this. Fixes #8573.

svn path=/branches/release/boost/log/; revision=84507
merge [83504] from trunk

svn path=/branches/release/boost/log/; revision=84525