get_cost_of_item() was giving different information from shop #chat
when dealing with containers owned by hero containing objects owned
by the shop. And when it was legitimately reporting a price of 0,
doname_with_price() wasn't reporting 'no charge' for items inside a
shop that were owned by hero or that shopkeeper didn't care about.
Extend the shop price reveal to far-look, but only when hero and item
being examined are inside the same shop.
projects / nethack / commit