should cure sliming. Implement the suggestion that quaffing a
burning potion of oil while turning into green slime will cure the
latter.
It's somewhat iffy since the slime is on the outside moving in and
the burning oil ends up on the inside, but the message sequence is
|You burn your face.
|The slime that covers you is burned away!
and it could be that igniting part of the slime quickly spreads to
the rest.
Implemented for monsters as well as for the hero. They will light
and drink the oil in a single turn in the extremely rare situation
where they actually have a potion of oil and need to use it.
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