Bug #3 is fixed

I believe bug #3 is now fixed after making it so that orders that are too large are not allowed. The game never leaves the store screen and zeroes the order quantities if the cost of the order is larger than the available amount of money. You can however still hit enter without buying anything. We should leave it that way because it would be possible to get stuck on that screen if we didn't have enough money to purchase anything and it forced a purchase before moving on.