Kqueue implementation done

Last night I fixed the last remaining bug in my Kqueue, and now everything works great.
Right now, there are 823 connections, and the server is taking less than 7% CPU. Before implementing this, it would have taken close to 20%.
And there are some other, non network related optimizations I can do (especially the stuff that trashes the CPU cache), so it's a good thing.
But more about them later.