Rework preloading. This now puts the preload to the left or to the right of the screen; it tries to simplify things, but unfortunately, kicks into less-than helpful browser behavior with scrolling to show offscreen elements. I've kept it primarily because it will make the upcoming swipe changes easier.
Remove some unused templates.
Remove unused wizard templates.
Hide the viewing resolution choice.
Remove the thumbsize selector; 320x256 is where it is at.
Remove the tag support; nobody is using it anymore.