Selling puzzles got a little tweak

A couple people have marked puzzles FOR FREE without meaning to. We just cleared that up.

Before, you could only mark a puzzle FOR SALE as a YES or NO option. Then you were supposed to fill in the price for the puzzle. It looks like a couple people intended to sell their puzzles but expected the buyer to make a price offer so they filled in the price as ZERO.

Now, instead of just YES and NOW, you have 4 options for the FOR SALE setting.

We also made some text changes when you start to make a purchase or trade offer to make these new status options more clear. We want to reduce the chance of error as much as possible.