Added SafeClientInterface so I could safely change the definition of ClientInterface but expect it to run with older versions.

src/org/moparscape/iface/ClientInterface.java

@@ -51,6 +51,15 @@ public interface ClientInterface {
      */
     public void setPort(int port);
 
+    /**
+     * Returns the server's address.
+     * <p/>
+     * This *MUST* be implemented correctly.
+     *
+     * @return The address the client would try to connect to, as set by setServer().
+     */
+    public String getServer();
+
     /**
      * Returns the server's port.
      * <p/>