request, disk i/o, increase width, auto detect net-speed

thanks for this app that i always use, i have some requests that i think would improve it

1. add disk activity as a bar
2. increase the width if the bars, they are very thin, they look good on the xubuntu version but are too thin on debian which uses your original design
3. the net speed seem to use the max value of the hardware instead of the max speed of the connection, you can detect the max connection speed with a simple algorithm that saves the max used speed and uses it as top value

in java: double max_speed = 0; max_speed = Math.max(max_speed, current_speed);

and use max_speed as reference value