
- More optimization.  Right now it seems like a lot of time is being
  spent on blits.  Could maybe improve a few other things.
- Add support for multiple color palettes, warping between palettes
- Blur between frames, possibly using GL instead of AppKit to draw
  (i.e., use the accumulation buffer).  This would help get rid
  of the sparklies
- Make the step size dependant upon the distance from the M set.
  This should hopefully allow us to stay longer in the interesting
  areas (there is some code in there already to do this, but there
  are problems with it).
  