Started to merge @ZobyTwo cmake branch

thirdparty/Boost/boost/units/dimensionless_unit.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_DIMENSIONLESS_UNIT_HPP
+#define BOOST_UNITS_DIMENSIONLESS_UNIT_HPP
+
+#include <boost/units/dimensionless_type.hpp>
+#include <boost/units/unit.hpp>
+
+namespace boost {
+
+namespace units {
+
+/// utility class to simplify construction of dimensionless units in a system
+template<class System>
+struct dimensionless_unit
+{
+    typedef unit<dimensionless_type,System> type;
+};
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_DIMENSIONLESS_UNIT_HPP