custom xmlrpc marshallers

[Alexander Larsson <alexl redhat com>]

I added some highly magic code that lets you register marshallers and
demarshallers for custom type for the XmlRpcHandler.

Check out ActiveTopic for an example of how to use it. With that i can
just define xmlrpc handler methods like:

  public Vector getLiveComment(ActiveTopic topic, int commentId) {

The conversion from the topic long id (which is passed as a string due
to 64bit ints parameters not being in xmlrpc) to the looked up
ActiveTopic is magically handled in the lower layers.

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl redhat com    alla lysator liu se 
He's a benighted neurotic ex-con with a robot buddy named Sparky. She's a 
strong-willed extravagent barmaid with the soul of a mighty warrior. They 
fight crime!