stockpile & liquid containers for trade

[ctopolon3]

make stockpiles & liquid containers markable for red\green hands
(e.g. :
A. i wtb 5 SP of any boards : i put 5 SP with 1board and mark them with "hand that takes"
B. i wtb 300l any milk : mark 3 barrels or 1 cistern, "sell button" = emptying 1-10-100L of seller's container with milk
C. i wts alot beer : mark cistern, set price for 1\10\100L, "buy button" = fill buyer's container with beer (mb even barrel on hands)
)

also liftable objects can be marked to sell, tile can be marked to buy liftable objects

P.S. purse for coins (mb 3x3 in shoes)