[DGD] Network extensions, LPC interface

[bart at wotf.org]

As DGD has had outbound tcp connectivity for a while, and is now getting some
rather desirable changes to UDP handling, it is quite desirable to drop part
of the network extensions in favor for the equivalent base functionality.

Doing so will change the LPC interface, most prominently:

- outbound tcp connections:

The connect() function is similar, but the callback to report connection
errors is not. This is a minimal change to the LPC interface.

- udp:
 
UDP will work in an entirely different way from how it currently works with
the network extensions, and will be much more similar to tcp connections (that
is, you get a user object for each 'udp connection' instead of a port object
for all of them)

My question is, is anyone actually using the current udp interface from the
network extensions? 

Bart.
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