Scatter/Gather support on DatagramChannel

[David M. Lloyd]

DatagramChannel has scatter/gather support for connected sockets but not 
unconnected sockets.

How about adding a couple methods:

   SocketAddress receive(ByteBuffer[] dsts) throws IOException;

   SocketAddress receive(ByteBuffer[] dsts, int offset, int length) throws 
IOException;

   long send(ByteBuffer[] src, SocketAddress target) throws IOException;

   long send(ByteBuffer[] src, int offset, int length, SocketAddress 
target) throws IOException;

I for one use scatter/gather frequently, and would really welcome such 
methods on DatagramChannel.

Thanks,
- DML