merged changes with the trunk after patch on assignment (only cosmetic changes)


git-svn-id: http://svn.boost.org/svn/boost/branches/release@84594 b8fc166d-592f-0410-95f2-cb63ce0dd405
Updated for TTI

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84599 b8fc166d-592f-0410-95f2-cb63ce0dd405
Docs update: ValueType of Boost.Any shall be CopyConstructible, not Move constructible (refs #6999)

git-svn-id: http://svn.boost.org/svn/boost/branches/release@84603 b8fc166d-592f-0410-95f2-cb63ce0dd405