* On the shownode page include the channels that a wireless interface
  is currently set to, by looking at the interface_settings table. So,
  if you click on an allocated node in the wireless map, you can see
  what channels it is using.

  Still to be done; map between a channel number and a frequency.

* On the floormap page, create a small table at the top of the page,
  listing what frequencies are in use on each floor. This is rather
  primitive of course, especially the part where I assume we have just
  one building, but it will do for now.

This is not complete. We probably need some sense of scale on the
maps.