This fixes the problem with my monster spell changes which let monsters
summon monsters around you when they don't even know you're around.
The summoned monsters should appear where the monster thinks you are, if
you're invisible or displaced.
I have not prevented them from summoning monsters when you are in a temple,
nor have I prevented them from aggravating monsters several times when you're
out of sight.
Messages should be a little smarter, taking into account number of monsters
and invisibility/displacement.
--Ken A
