Optimization of boost:asio code is now disabled when building with
BOOST_ERROR_CODE_HEADER_ONLY under GCC versions 5.2.0 through 5.3.0.

src/lib/asiolink/asio_wrapper.h
    New file which wraps boost/asio/asio.hpp around compilation
    logic to suppress optimization under GNU 5.2.0 thru 5.3.0.

The remaining changes either removed the inclusion of <asio/asio.hpp> or
replaced it with the inclusion of <<asiolink/asio_wrapper.h>.  Inclusion
file order was also altered to better comply with our coding guidelines.