Improve the expressiveness of ttyinfo (^T) when dealing with threads

in slightly less usual states:

  If the thread is on a run queue, display "running" if the thread is
  actually running, otherwise, "runnable".

  If the thread is sleeping, and it's on a sleep queue, display the
  name of the queue, otherwise "unknown" -- previously, in this situation
  we would display "iowait".

  If the thread is waiting on a lock, display *lockname.

  If the thread is suspended, display "suspended" -- previously, in
  this situation we would display "iowait".

  If the thread is waiting for an interrupt, display "intrwait" --
  previously, in this situation we would display "iowait".

  If the thread is in a state not handled by the above, display
  "unknown" -- previously, we would print "iowait".

Among other things, this avoids displaying "iowait" when the foreground
process turns out to be suspended waiting for a debugger to properly
attach.

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