Jumping performs the placement of the last step after using hurtle()
to move to the destination, so if hurtle() triggered a trap then it
would happen twice. Report was for a Sokoban pit but it would happen
for fire traps too. Other traps would yield "you pass over <trap>"
while hurtling and then trigger the trap when landing. Have
hurtle_step() ignore a trap for the last step of a jump, leaving it
to the jump's landing to handle.
Also, give feedback when hurtling over water or lava, similar to what
happens when passing over a previously seen trap which doesn't
activate.
37f8d0edb3