Add clickpic: Click on a picture and output the coordinates
Add tools around clickpic to do WLAN quality mapping
Add 2dblobs

Expects data like this on stdin:

	10 5 0.8
	26 77 0.2
	80 80 1
	80 65 1

In general:

	x y weight

Outputs a PGM graymap on stdout (width $1, height $2) showing the iso
surface.