TODO:

some random thoughts what could be added/tweaked:

gai-temp.c
 - create a nicer none-gnome-panel drawing version

 - find a way to change the temperature unit in the preference-dialog

 - execute some program when temperature is high/critical

 - add a message dialog when no sensor is found and
   cancel updating

 - let the user choose an custom icon for each sensor

readtemp.c

  - add variants of the reading functions that only update the existing 
    temperature-structs in the list (makes sense for read_lm_sensor_temp)
