#18 Split UpdateProtocol.pm

[Eric Kidd]

Split UpdateProtocol.pm into a thinned-down copy of itself and an UpdateClient.pm class, to match the Java class hiearchy--and change the names of the public entry points.

This is a very low priority fix--nobody has written an UpdateServer in Java, so there's no pressing need to separate the client logic from the protocol logic.

[Eric Kidd]

Once this is done, update the code in customdns.cgi, too, especially the hand-rolled client interface. This should *really* use something like the Java client interface.