Zapping wand of opening or spell of knock at engulfer while swallowed
would make the engulfer expel the hero; this change makes zapping
other holders release their hold. Zapping self now achieves the same
effect, as does breaking a non-empty wand of opening. When poly'd
hero is holding a monster rather than being held, that monster will
be released.
Engulfers can't re-engulf for 1 or 2 turns after releasing the hero
in order to prevent hero from being immediately re-engulfed. Impose
the same limitation on other holders.
5d6ab55372