#1 Netxx doesn't support broadcast packets

[Randy Sharo]

The summary says it all...

All that needs to be done is to add a method to set the
SO_BROADCAST socket flag for Datagram and
DatagramServer objects.

I have a DatagramServer that I'd like to use to send
broadcast packets. I'd just set the SO_BROADCAST flag
myself outside the NetXX library but, unlike the
Datagram class, no file descriptor accessor has been
provided...