- Add a new function "sched_interact_update()" that scales back the sleep

   and run time.
 - Scale the sleep and run time back via sched_interact_update() in more
   places.  This is to keep the statistic more accurate.
 - Charge a parent one tick for forking a child.
 - Add only the run time and not the sleep time to the parents kg when a
   thread exits.  This allows us to give a penalty for having an expensive
   thread exit but does not give a bonus for having an interactive thread
   exit.
 - Change the SLP_RUN_THROTTLE to limit us to 4/5th and not 1/2.
 - Change the SLP_RUN_MAX to two seconds.  This keeps bursty interactive
   applications like mozilla and openoffice in the interactive range even
   through expensive tasks.
 - Recalculate the slice after every sleep.  This ensures that once a task
   has been marked interactive it only has a slice of 1 at the risk of
   giving tasks that sleep for a very brief period a longer time slice.

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