ULE 3.0: Fine grain scheduler locking and affinity improvements. This has

been in development for over 6 months as SCHED_SMP.
 - Implement one spin lock per thread-queue.  Threads assigned to a
   run-queue point to this lock via td_lock.
 - Improve the facility for assigning threads to CPUs now that sched_lock
   contention no longer dominates scheduling decisions on larger SMP
   machines.
 - Re-write idle time stealing in an attempt to make it less damaging to
   general performance.  This is still disabled by default. See
   kern.sched.steal_idle.
 - Call the long-term load balancer from a callout rather than sched_clock()
   so there are no locks held.  This is disabled by default.  See
   kern.sched.balance.
 - Parameterize many scheduling decisions via sysctls.  Try to document
   these via sysctl descriptions.
 - General structural and naming cleanups.
 - Document each function with comments.

Tested by:	current@ amd64, x86, UP, SMP.
Approved by:	re

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