AlarmClock tweaks.

AlarmClock tweaks.

- No more layout jumps when switching between dim/undim
  modes
- Now registers itself as the "dock home"---that is, it
  hijacks the home softkey away from Launcher while the
  device is docked
- Shows "on top" of the keyguard; all exits, however, will
  return to the keyguard before completing
- Now uses the WindowManager to hold a wakelock when
  necessary
- Tweaked weather display (bringing the weather icon size
  under control)