- added diagrams to asiolink documentation
 - eliminated improper error return in TCPServer operator()
 - moved UDPEndpoint, TCPEndpoint, UDPSOcket, TCPSOcket implementation
   code into internal/udpdns.h and internal/tcpdns.h
 - RecursiveQuery ns_addr_ member now an IOAddress rather than asio address
 - add method headers in recursor.h and auth_srv.h
 - change asio_link unittest name to asiolink


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac327@3177 e5f2f494-b856-4b98-b285-d166d9295462