Creates a newXMLRPC::Server instance, which is a XML-RPC server listening on the given port
and accepts requests for the given host, which is
localhost by default.
The server is not started, to start it you have to call
XMLRPC::Server#serve.
The optional audit and debug parameters are obsolete!
All additionally provided parameters in *a are by-passed to
XMLRPC::BasicServer.new.