- Add a test for complex.h to configure (mainly for FreeBSD which seems
  no to have this)

- Arrow on the connecting lines

- Click on dots to go to the component/load, and mark component/load if 
  selected in list

- Labels to the intermediate points

- Input of impedances as S-parameters (maybe Y-parameters too)

- Optional lines through points indicating wavelengths

- Export the numeric impedance list to a text file (csv?)

- Export of a screen shot of the map (but not just the visible part)
  to an image file

- Make the points moveable by dragging them on the chart (the handler
  is already in place)

- Some kind of auto-optimization?

- Automatically generate a legend of the colors used.