Corrected compilation with MSVC 11.

git-svn-id: https://boost-log.svn.sourceforge.net/svnroot/boost-log/branches/v1@801 ab6a8de6-4e00-4c3d-a860-8899c17d353f
Updated changelog.

git-svn-id: https://boost-log.svn.sourceforge.net/svnroot/boost-log/branches/v1@802 ab6a8de6-4e00-4c3d-a860-8899c17d353f
Fixed possible buffer overruns in compare.

git-svn-id: https://boost-log.svn.sourceforge.net/svnroot/boost-log/branches/v1@867 ab6a8de6-4e00-4c3d-a860-8899c17d353f