* gnu/java/nio/DatagramChannelImpl.java

* gnu/java/nio/DatagramChannelImpl.java
	(inChannelOperation): New field.
	(isInChannelOperation): New accessor.
	(setInChannelOperation): New modifier.
	(receive): Use capacity() - position() of destination
	buffer instead of remaining(). Set and reset our "in
	channel operation indicator" before and after delegating
	the receive to our datagram socket. Removed testing code.
	Update destination buffer's current position if it is
	backed by a byte array (hasArray() is true).
	(send): Set and reset our "in channel operation indicator"
	before and after delegating the send to our datagram socket.
	Removed testing code. Update source buffer's current position
	if it is backed by a byte array (hasArray() is true).
	* gnu/java/nio/SocketChannelImpl.java (read(ByteBuffer)):
	Use capacity() - position() of destination buffer instead
	of remaining().
	* java/net/DatagramSocket.java (receive): Don't throw an
	IllegalBlockingModeException if we have a non-blocking
	channel which initiated this operation.
	(send): Likewise.

From-SVN: r77173