added the TraderView into the templated files.
put the trader page into templating, locked post-creation to signed in users, fixed the navigation, and added a recent posts-per-trader listing.
I changed the nav a bit more, added more user authentication, added a paginated list of posts (which is rudimentary looking, but otherwise fully functional), converted everything that was a db.Model or GqlQuery to a ndb.Model and a Class.query(), and then tried to fix anything that was inadvertantly broken in that process.