When a stack of N corpses is hit by wand or spell of undead turning,
1 revives and N-1 remain corpses. If owned by a shop, a fee for
using up all N corpses was charged and if carried at the time, the
extra N-1 became owned by the player but if on the floor, they
remained owned by the shop. Feedback was schitzophrenic as to
whether the whole stack was involved:
One of the <foo> corpses glows irridescently.
You owe <shk> X zormids for them.
Split the stack so that revival explicitly operates on only 1 corpse.
It's done after the revival side of things has already succeeded or
given up, so the split will never need to be undone.
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