Cutting a shopkeeper poly'd as a long worm would generate strange messages
and could result in a crash. cutworm didn't deal with all the intricacies
of duplicating a monster. Fixed by changing cutworm() to use clone_mon()
to do most of its dirty work. It seems to me that without this change,
cutting a tame long worm could also have similar bad effects.
Other side effects of this change:
- clone_mon now takes x,y coordinates, 0,0 results in previous behavior
- clone_mon no longer always makes cloned monsters tame/peaceful if player
caused the clone, using the same formula previously in cutworm. Someone
else may wish to tweak this for gremlins.
- clone_mon will christen the new mon with the old shopkeeper's name, even
though clones are never shopkeepers (game can't handle 2 for a shop)
- cutworm can now be called during conflict or pet combat, although I
added no such calls (yet)
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