message: Contract enables gold trading
diff: <iPower>3</iPower>
  <bTrade>1</bTrade>
  <bGoodyTech>0</bGoodyTech>
  + <bGoldTrading>1</bGoldTrading>
  <bVassalTrading>1</bVassalTrading>
  <iGridX>4</iGridX>
  <iGridY>7</iGridY>
  <iAsset>20</iAsset>
  <bTrade>1</bTrade>
  <bGoodyTech>0</bGoodyTech>
  - <bGoldTrading>1</bGoldTrading>
  <iGridX>5</iGridX>
  <iGridY>7</iGridY>
  <Flavors>
  