ordering queues and turns_since_clued

order_play_q and order_discard_q are poorly written but should do about
what we think we'll probably want them to do.   I need to remember to
also have the default cards ordered by position.

turns_since_clued should be useful.  Mostly I wanted to write at least
one thing that used the log so that I could start thinking about how
that sort of thing would operate.  Potential to upgrade: differentiate
_effective_ clues from _ineffective_ clues.