fix #H7385 - double trap activation when jumping

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.

doc/fixes36.2

@@ -114,7 +114,7 @@ add window port status_update() value BL_RESET to use as a flag to
 for hilite_status of string status fields (title, dungeon-level, alignment),
 	the types value-goes-up and -down aren't meaningful; treat them as
 	value-changed if from config file and don't offer as choices with 'O'
-spiders will occasionally spin webs when moving around
+jumping into or over a Sokoban pit, or over a fire trap, triggers trap twice
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository
@@ -182,6 +182,7 @@ make it clear when a leprechaun dodges your attack
 wizard mode #wizidentify can now select individual items for permanent 
 	identification and don't display the selection to permanently
 	identify everything if everything is already fully identified
+spiders will occasionally spin webs when moving around
 
 
 Code Cleanup and Reorganization