Fix some minor buglets in wump:

1) Don't put two pits in the same room.
2) Don't put bats and pits in the same room.  (you will never hit the bat)
3) Don't start the player in a room with a pit or bad, if possible.  Some
caves are so crowded the loop may go on forever, so we give up after 100
tries to put them in a safe location (as long as it's not with the wumpus).
4) Make the manpage reflect reality WRT the default number of rooms.

Bug #3 pointed out by salo.

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