- Use a new flag, KEF_XFERABLE, to record with certainty that this kse had

   contributed to the transferable load count.  This prevents any potential
   problems with sched_pin() being used around calls to setrunqueue().
 - Change the sched_add() load balancing algorithm to try to migrate on
   wakeup.  This attempts to place threads that communicate with each other
   on the same CPU.
 - Don't clear the idle counts in kseq_transfer(), let the cpus do that when
   they call sched_add() from kseq_assign().
 - Correct a few out of date comments.
 - Make sure the ke_cpu field is correct when we preempt.
 - Call kseq_assign() from sched_clock() to catch any assignments that were
   done without IPI.  Presently all assignments are done with an IPI, but I'm
   trying a patch that limits that.
 - Don't migrate a thread if it is still runnable in sched_add().  Previously,
   this could only happen for KSE threads, but due to changes to
   sched_switch() all threads went through this path.
 - Remove some code that was added with preemption but is not necessary.

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