killing pets by displacing them into traps

killing pets by displacing them into traps

     A user pointed out that you lose pacifism conduct if you kill your
pet by displacing it into a trap but you don't gain any experience in
the process.  Make this consistent with killing monsters in other ways:
if you get blamed for it then you should also get credit for it.

     Probably minliquid() and mintrap() should take another argument so
they can call killed() instead of mondead() when necessary, but I didn't
go to that much effort....