Better timing code

John Stultz has a new timer system
Massive code cleanup
Good handling of timer hardware
Start working in nanoseconds units

Nishanth Aravamudan goes further
Replace jiffies with nsec_t
Change timer APIs to work in nanoseconds
Makes higher-resolution timers possible
No more jiffies <--> time conversions

Do we need a timer tick at all?
Very costly
Expecially for laptops and virtualized systems
Dynamic tick patches make the tick go away
Simply put system to sleep until something must happen