def super_and_sub?(sup, sub)
      fqsup = qualify(sup)
      cls = qualify(store.get_superclass(sub), sub)
      until cls.nil?
        return true if cls == fqsup
        cls = qualify(store.get_superclass(cls), cls)
      end
      false
    end
def super_and_sub?(sup, sub)
      fqsup = qualify(sup)
      cls = qualify(store.get_superclass(sub), sub)
      until cls.nil?
        return true if cls == fqsup
        cls = qualify(store.get_superclass(cls), cls)
      end
      false
    end
Check if a class is a superclass of another class.

 @param sup [String] The superclass
 @param sub [String] The subclass
 @return [Boolean]