monster and Elbereth unless there's no other choice.
Suggested by NetSysFire, don't create new monsters on top of scrolls
of scare monster. Not mentioned in the suggestion: unless they are
a type of monster that isn't affected by such scrolls. This extends
it to teleport destination too.
Avoid placing a monster on a scroll of scare monster or on engraved
Elbereth if there are other locations available. Only performed for
callers of goodpos() who explicitly request it, which at the moment
are makemon(), rloc(), and enexto().
Also, propagate 'mmflags_nht' to a bunch of places that were left
using long or unsigned for makemon() and goodpos() flags. I didn't
attempt to be systematic about that though.
Implements #717
f0c7394968