Shows "Sell Price per unit" in the tooltip of item stacks.
Shows "No sell price" label for unsellable items while not at a vendor.
For classic: Shows the sell price while not at a vendor.
For classic: Adds "Sell Price:" prefix while at a vendor.
Recipes: Always show the sell price at the bottom of the tooltip, even while not at a vendor. Tooltip additions by other addons get placed below this.
Bagnon: See the correct prices for cached stacks (i.e. when looking at bank items while not at the bank or when looking at inventories of other toons).
