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small things
  set centroid variables for drift correction
  verify that we work properly with fisheye

medium things
  there should be a Cactus test suite
  HDF5 data files
  move origin point
  export a "compute h(theta,phi)" function
     so other thorns could test point membership in/outside AH etc
  prevent h from going negative if the iteration isn't converging
     (maybe use log(h) in Newton iteration?)

large things
  multi-processor (interpolator, overall control)
  sparse matrix elliptic solver
  handle quadrant/octant grids
     (needs Jacobian of one ghost zone to cover two different ghost zones)
  "isolated horizons" computation of BH mass and spin