Improvements/fixes to the shop directory system based on player feedback:

The directory will:
* No longer show items that are on a shelf you cannot see.
* Now list its prices after applying any shop policy discounts or markups.
* Now display enchantments and will search for enchantments if you do something like DIRECTORY ICEWALL.
* Now display weapon/armour stats if you have weaponprobe.

Penned by my hand on an unknown date.