Started to merge @ZobyTwo cmake branch

thirdparty/Boost/boost/units/reduce_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) 2007-2008 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_REDUCE_UNIT_HPP_INCLUDED
+#define BOOST_UNITS_REDUCE_UNIT_HPP_INCLUDED
+
+namespace boost {
+namespace units {
+
+#ifdef BOOST_UNITS_DOXYGEN
+
+/// Returns a unique type for every unit.
+template<class Unit>
+struct reduce_unit {
+    typedef detail::unspecified type;
+};
+
+#else
+
+// default implementation: return Unit unchanged.
+template<class Unit>
+struct reduce_unit {
+    typedef Unit type;
+};
+
+#endif
+
+}
+}
+
+#endif