made wrappers for libxfr (we need another name for that, i suggest libfdshare), xfrout can now work without boost.python. Boost-system is still needed for boost.asio



git-svn-id: svn://bind10.isc.org/svn/bind10/experiments/python-binding@1837 e5f2f494-b856-4b98-b285-d166d9295462