part of pull request #737 - pets approach \

hero when hero is [impatiently waiting...] on stairs

My attempts to cherry-pick this failed, so this was done manually.
It is a reimplementation of
NullCGT:feature/monster-item-use:dc2cef0562542fece1732dd2d4c4f0775308faff

] Pets approach the player if they are standing on the stairs.
]
] One of the most frequent complaints I have seen is that pets refuse
] to follow their owners down the stairs. While this can be resolved by
] waiting, most players, especially new ones, are not willing to spend
] multiple dozens of turns waiting for their pets to approach closely
] enough to follow them. This simple commit makes pets react to a player
] standing on stairs as if the player is holding a tripe ration. Simple,
] non-disruptive, and should solve many headaches.

doc/fixes3-7-0.txt

@@ -1566,7 +1566,9 @@ extend farlook's "<mon>, asleep" to "<mon>, can't move (paralyzed or sleeping
 	that is waiting for hero to approach
 add body part terminology for spiders; enhance it for cockatrices
 context sensitive item usage menu from inventory, aka "item actions"
-
+pets are more likely to follow you closely if you are carrying something they
+	really like to eat; behave as if you are carrying such whenever you
+	are standing on stairs so that pets will try harder to come to you
 
 Platform- and/or Interface-Specific New Features
 ------------------------------------------------