Make the Merchant BUY from players and a create discount field

[LeandroMartinelli]

If the player drop one item in the merchant sheet, the player could receive like 50% of the value of the item

• This 50% need to be a field in the sheet, so each merchant can have one "price"
• In the Sell procedure, one field could indicate a % of discount ou increase in the original value of the item

This way the merchant sheet will be way more valuable and handy to use.
Thanks and keep up the good work!