Incomplete work for using Boost.Polygon to compute medial axis

xs/src/boost/config/abi/msvc_prefix.hpp

@@ -0,0 +1,22 @@
+//  (C) Copyright John Maddock 2003. 
+//  Use, modification and distribution are subject to 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)
+
+//
+// Boost binaries are built with the compiler's default ABI settings,
+// if the user changes their default alignment in the VS IDE then their
+// code will no longer be binary compatible with the bjam built binaries
+// unless this header is included to force Boost code into a consistent ABI.
+//
+// Note that inclusion of this header is only necessary for libraries with 
+// separate source, header only libraries DO NOT need this as long as all
+// translation units are built with the same options.
+//
+#if defined(_M_X64)
+#  pragma pack(push,16)
+#else
+#  pragma pack(push,8)
+#endif
+
+