* Animated backgrounds now play on old phones. Images are prepared once, in the
  settings screen, into frames the size your screen shows and in the format it
  wants, so the clock never decodes anything while it is drawing.
* A GIF too large to play is no longer shown as a single frame: it is made
  smaller and played.
* Each frame is drawn into a small buffer and put on screen by the graphics
  hardware, instead of dragging the whole screen onto the slow drawing path.
* Setting reteclock as your screensaver is now one button, under Dock: it says
  whether it already is, and opens Android's own screensaver screen - which
  hides somewhere different on every version.
