- Add in support for KSEs with 0 slice values on the run queue. If we try

   to select a KSE with a slice of 0 we will update its slice and insert it
   onto the next queue.
 - Pass the KSE instead of the ksegrp into sched_slice().  This more
   accurately reflects the behavior of the code.  Slices are granted to kses.
 - Add a function kseq_nice_min() which finds the smallest nice value
   assigned to the kseg of any KSE on the queue.
 - Rewrite the logic in sched_slice().  Add a large comment describing the
   new slice selection scheme.  To summarize, slices are assigned based on
   the nice value.  Priorities are still calculated based on the nice and
   interactivity of a process.  Slice sizes of 0 may be granted for KSEs
   whos nice is 20 or futher away from the lowest nice on the run queue.
   Other nice values are scaled across the range [min, min+20].  This fixes
   ULEs bad behavior with positively niced processes.

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