Don't provide min/max for in8, which allowed one to scribble on
registers one should not be messing with. (My fault, oops.)

The setting of the temp high/low registers was off by one, not mine this
time.  While I was at it, I reordered a few other register accesses to
be base 0 instead of base 1.

The temp interface was slightly incorrect, degrees * 100 instead of
degrees * 1000, also fixed.

And lastly, when changing the fan count divisor, fix up the min setting
to still be roughly the same. (Previously the meaning of the value in
the register changed, but not the value itself, resulting in, undesired
surprises.)