Shopping List gadget updated

My shopping list gadget was one of my first, and is still my most popular. It was originally written as an inline gadget, and has been inline all the time, up till a few days ago. But lately I had complaints about problems with it. So this weekend a took a look. It seems like inline gadgets do not work as before anymore. Inline is actually not supported for new gadgets, so this is not a surprise. So I had to rewrite it and change the type. I also removed all the __MODULE_ID__, which are no longer needed, since it is rendered in an IFRAME.