Create a log entry when item is removed from cart or qty is changed programatically.

We will eventually set a message when the item or quantity is unavailable, but we should also create a log entry when an order item is removed or quantity is changed programatically, eg. during order refresh. Right? Because now we show the order added to the cart, even if it isn't. We can't know if it's going to get removed--to create the first log entry conditionally, so at least we should create a follow-up entry for the removal/change.