Same race corpses, deceased pet corpses, wraith corpses, and unicorn
corpses could be sacrificed even when otherwise too old. This
prevents that for wraith and unicorn corpses but leaves the same
race and dead pet cases as is. I'm not sure that this is the right
way to resolve things but at least has the virute of being simple.
This also lets chaotics get the trivial bonus for sacrificing a
wraith corpse even though alignment matches. Alignment doesn't
matter for anything else (except unicorns) and giving up a wraith
corpse that isn't too old to eat is a tangible sacrifice. Unless
the hero is vegetarian (or the supersets vegan and foodless) since
giving up a corpse that won't be eaten isn't worthy of a bonus.
(It will still retain regular sacrifice value in that situation.)
Fixes#304
549f6fba52