c87ecd0eb3
group list because that may contain the same tile multiple times when tiles that contain multiple features are included in a single claim group with both of their features. So we have to do some extra jockeying to ensure that we count a tile only once. git-svn-id: https://samskivert.googlecode.com/svn/trunk@436 6335cc39-0255-0410-8fd6-9bcaacd3b74c