Assorted cleanups:

- replace hardcoded sizes with sizeof()
- pqueue_find() apparently used to need to keep track of the previous node
  when iterating, which causes its logic to be complicated. However, nowadays
  it only needs to iterate, so replace with a straightforward, much
  readable logic.
- remove #if 0'ed code

From ``sin'' from 2f30 dot org on tech@, thanks!

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