Happy Harvest

0.6.1: Contracts on screen and fixes

• Contracts box: a see-through box in the corner of the screen lists your accepted contracts, how many items are missing, how many you have in your inventory and which ones are done. It hides while a screen is open. Turn it off with the showContracts client option.
• Traveling Trader: the tabs now say what you do: Sell, Buy and Rare. In the Sell tab, the tooltip explains the click.
• Item tooltips now say "Market price" instead of "Sells for".
• Contract Board: the progress and the reward of a quest no longer overlap.