292 - back to state of commit 276

What have we learned?

  a) You can't detect deadlock between running a thread and waking up
  sleeping threads -- you may miss threads that are about to become
  available.

  b) Most of the context-switching code in 'run' shouldn't assume
  routine* is correctly set. That's just for 'run-for-time-slice' and
  for checking on blocked threads. I was implicitly requiring it when I
  shouldn't, and not setting it when checking blocked threads.

Before I fix the next failing test I want to write unit tests for a)
above.

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