TODO

* the icons are not perfectly clear (difference in/out) [done]
* option to show frame/don't show frame around applet [done]
* option to show sum instead of in/out [done]
* plipX device support ? [done]
* themeable icons ?
* set size of labels according to the maximum possible size [done]
* add a load-graph to the details-dialog ? [done]
* if showsum is on the label should be center-justified in
  a >= 48 panel [done]
* let the user chose between bit and bytes [done]
* let the user chose the icon themselves (instead of setting it
  according to the device) [done - but in another way]
* ...