Started to merge @ZobyTwo cmake branch

thirdparty/Boost/boost/units/systems/si/surface_density.hpp

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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNITS_SI_SURFACE_DENSITY_HPP
+#define BOOST_UNITS_SI_SURFACE_DENSITY_HPP
+
+#include <boost/units/systems/si/base.hpp>
+#include <boost/units/physical_dimensions/surface_density.hpp>
+
+namespace boost {
+
+namespace units { 
+
+namespace si {
+
+typedef unit<surface_density_dimension,si::system>  surface_density;
+
+BOOST_UNITS_STATIC_CONSTANT(kilogram_per_square_meter,surface_density);
+BOOST_UNITS_STATIC_CONSTANT(kilograms_per_square_meter,surface_density);
+BOOST_UNITS_STATIC_CONSTANT(kilogramme_per_square_metre,surface_density);
+BOOST_UNITS_STATIC_CONSTANT(kilogrammes_per_square_metre,surface_density);
+
+} // namespace si
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_SI_SURFACE_DENSITY_HPP