This fixes several major UI inefficiencies:
* playWeb.coffee triggered output updates that were being suppressed by play.html
I removed these. The output updates less frequently and is completely
controlled by play.html. Eventually, all of the CoffeeScript in play.html should
be merged with playWeb.coffee, but that's a different issue.
* We were calling zeroTimeout very frequently. zeroTimeout is fast, but not
free. We now call it approximately 4 times a second, enough to keep the browser
from timing out, but not enough to cause noticeable performance overhead.
* We had released control back to the browser based on the number of games played.
We also updated the graphs based on the number of games played. Doing this
way, we needed to be pessimistic about AI and browser performance. We now
release control when a game is over and we've had control for more than .25s.
* We were updating the DOM whenever we added a page to the log, even when we
updated "quietly" because we updated the paginator. We now detect if the
pagination has changed before updating it.
Combined, these changes allow the "slow mode" simulations to run nearly as fast
as the fast mode. In Firefox, the UI updates in slow mode cause about 10%
runtime overhead. Because of this, I removed the fast mode checkbox.