introduce changes from streamside fork

data/talkactions/scripts/sellhouse.lua

@@ -0,0 +1,19 @@
+function onSay(player, words, param)
+	local tradePartner = Player(param)
+	if not tradePartner or tradePartner == player then
+		player:sendCancelMessage("Trade player not found.")
+		return false
+	end
+
+	local house = player:getTile():getHouse()
+	if not house then
+		player:sendCancelMessage("You must stand in your house to initiate the trade.")
+		return false
+	end
+
+	local returnValue = house:startTrade(player, tradePartner)
+	if returnValue ~= RETURNVALUE_NOERROR then
+		player:sendCancelMessage(returnValue)
+	end
+	return false
+end