From a bug report, a shopkeeper who's been
polymorphed into a limbless creature shouldn't be able to come take your
possessions when you die since you can't pick up items when in that shape.
Rather than add new special case handling for shopkeepers, prevent them
from taking on shapes that render them unable to behave like shopkeepers
so that they can continue to catch thrown pick-axes and assorted other
things that would otherwise need a lot of extra checking introduced.
Ditto for temple priests, vault guards, and quest leaders. Restriction
also applies to wizard mode use of #monpolycontrol, the only place where
players can actually notice this.
It could--perhaps should--restrict them even further, forcing forms
that retain speech capability, but I didn't go that far.
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