Chrono: set precission to 9 so that there is no lost with the hisgest systemp_clock precission (nanoseconds). todo, adapt the io precission to the system_clock duration period.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86383 b8fc166d-592f-0410-95f2-cb63ce0dd405
Chrono: try to avoid the crash with msvc 11 on chrono_io.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86384 b8fc166d-592f-0410-95f2-cb63ce0dd405
Added optimizations for C++11 and SSE. Refs #8509.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86385 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fixed compilation.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86386 b8fc166d-592f-0410-95f2-cb63ce0dd405
Restored check for unsupported compilers

git-svn-id: http://svn.boost.org/svn/boost/trunk@86387 b8fc166d-592f-0410-95f2-cb63ce0dd405