Disable laptop touchpad

[Chris Jones]

> If you are writing a lot, it's gonna become a real PITA to re-
> position the cursor every single time you brush the touchpad. 
> Especially when writing while you're on a train, this can *really* 
> get out of hand.

Can't say that has ever happened to me... Probably depends on where the 
pad is though. My is in the centre of the machine, and so my hands 
nicely fit either side...