Move (+) to last filter

• Clicking (+) adds a row at the bottom of the filter list.
• Yet the icon is at the top of the filter list.
• Have it appear on the last [new] row when clicked. Thus it is (a) near where new filter row added and (b) an "append" or "add below this row" icon.
• Handle (-) clicking. Easiest is via events and removing all (+) [1-line] and then adding to last filter row [css&jquery ~ 1 line]