109.60.00

- Fixed a bug in detection of the thread pool being stuck that could
  overstate the amount of time the pool was stuck.

    It had been incorrectly reporting the duration of the thread pool
    being stuck if the pool had no work in it and then got enough jobs
    to be stuck.  In that situation, the duration included the time span
    before the pool got stuck.  If the pool had been idle long enough,
    this could even spuriously abort the program.