This uses Michael's suggestion for keeping the display up to date when
removing a djinni or water demon in advance of granting a wish (so that it
won't be present in a bones file if the wish is fatal--problem with earlier
fix was that player could notice monster was already gone while responding
to the wish prompt). It's not quite as straightforward as I was hoping for
and would get a lot messier if it needed to cope with Warning & Warn_of_mon.
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