While an object is being thrown, it isn't on any list. This means that
killing a shopkeeper with an unpaid object wouldn't be able to clear the
unpaid bit. By the time the object lands, the shopkeeper is gone, and then
it's too late. Added a new global to track a thrown object, set it and later
clear it in throwit(), also clear it as needed in dealloc_obj(), and check
it in setpaid(). It should be possible to use this global to avoid losing
thrown objects during hangup saves as well. But that can wait.
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