2 added -d <dev> option to select the device that should observe, e.g. hda or sda
3 (thanks to Carles Garrigues and krakov)
4 added small point befor IOR and IOW only if the change of IOR or IOW was to small
5 to display with the scale. Result: .IOR or .IOW
8 added support for kernel 2.6.x
12 fixed division by zero bug, if no swapfile available (thanks João Paulo F Farias)
15 added mem correction option (-m) // used=total-free-cached-buffers
16 patched width calc at r_io and w_io