iwmap: Give audible signal after each scan
Merge remote-tracking branch 'sedna/master'
Add remaining scripts to do WIFI mapping

Ok, here's how you do it:

- Get hold of a map of your building/area. Say it's map.png.
- Start "iwmap -i wlan0 -m map.png >map.dat"
- Run around, click on the map. A sample is taken for each click.
- When finished, run "iwmap_plot -d map.dat -m map.png -a foo >bla.pgm"
- Run "iwmap_found_aps <map.dat" to see which access points have been
  mapped.

You need sudo access to "iwlist".

You'll also need my invdist tool -- which, sadly, is not yet public. So,
in fact, YOU can do nothing yet. :-)

That selector "-a foo" is a regular expression. It matches against the
output of "iwmap_found_aps".