The fancontrol script needs to be a little smarter about dual core CPUs.
Right now it assumes a 1-1 correspondence between the temperature inputs
and the controlled fans.  But in a typical dual core setup there are 2
separate temperatures but only 1 fan.  What algorithm to use to determine
when to trigger the fan, based on the 2 (or more) inputs, is an interesting
question.  Average, geometric mean, maximum, or?