boost::swap is deprecated and will be removed. Use boost::core::invoke_swap
as a replacement, where needed.
Removed "using boost::swap" in common.hpp, since this is not the intended usage
of Boost.Swap, and doing so did not add anything to the existing code (which
already did "using std::swap").
Corrected documentation re. compatibility with boost::swap/
boost::core::invoke_swap. It does not (and never did) use member swap()
functions, but simply forwards to either std::swap or the user-defined free
function overload (which, in turn, may forward to the member swap()).
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