Adding Field Papers as editor; solves issue #285

Read issue #285. I added a menu item in the editor template and added the proper link template to pull up a given tile area on Field Papers; right now, I can't determine the correct link queries to control the actual size of the square on Field Papers, but it's at least in the correct area and on the right zoom. Sorry about the dual pull requests--first one was off a fork that was modified prior to branching.