Returns on every product, and a fairer completeness score

The product list has a new Returns column — the return rate, with the units behind it — and you can sort by it without an item sold three times jumping to the top. Each product page also shows the searches customers used to find it.

Completeness is now stricter and consistent: the list and the product page score the same way, and products no longer earn points for fields their attribute set doesn't declare.