code: static Wrapper unwrap( Com4jObject obj ) {
          if( obj instanceof Wrapper )
              return (Wrapper)obj;
          else
              return (Wrapper)Proxy.getInvocationHandler(obj);
      }
docs: Unwraps a given {@link Com4jObject} (returns the Wrapper object of the Com4jObject, which might be a proxy object)
  @param obj the Com4jObject
  @return the {@link Wrapper} object of the {@link Com4jObject}
  TODO: Think about whether to remove this method or mark it as deprecated, since this method is not used any more by Com4J itself