[PC-BSD Dev] powerd replacement

[Florian Stinglmayr]

Hey ho,

I recently played around with powerd and looked through its source code. 
  And to my humble opinion it is not very feature rich. Though CPU 
frequency scaling is an important feature, it won't do other things that 
can save power on a notebook, for example dimming the monitor, or going 
automatically into stand by. Also the powerd daemon lacks some kind of 
dynamic update and dynamic "profile" support.

Therefore I decided to either replace powerd completely or to update it. 
What do you guys think is better? Or should we try to port KPowersave 
instead?

Florian