more work to make indicators more helpful

- allow in-map indicators to work-around camera-centering hack;
  camera-centering hack should be fixed instead.
- this is a problem because we create additional tiles to buffer the
  map, this ends up offsetting the indicators and showing them in
  unhelpful spots. This is a stupid hack that has huge impacts on the
  design and engineering of this feature.
- work on issue #16