Basic functionalities:

- get the js code to work with DRF (full-AJAX)
  → WIP, hackish but works somewhat, coordinate reference is wrong (pixel in backend, x in 0..1 and y in -0.5..0.5 in frontend)

- hire a HTML5/CSS designer :-)


Background work:

- use Celery for computation-intensive tasks (generating tiles)
  => in progress.  We should display the progress of tiles generation
  in the panorama view.


New features:

- Create new reference points directly in the panorama view (right click /
  new ref point / ask coordinates, name, etc).  Even better: open a pop-up
  or a new page with a map, so that the reference point can be placed on it.
  We could even fetch the ground altitude automatically, and only ask the
  altitude above ground.

- ability to click and drag a reference point in the UI when it is not
  at the right place
