Changed influence values to be more intuitive to tweak in code. The canvas now also wraps, so boids that disappear off one side of the canvas appear at the opposite side, leading to an interesting effect.
There is now a force around the edges of the canvas that keeps voids from disappearing. Forces are tweaked a little. Boids are no longer given a random starting velocity.
Added some sliders to change force magnitudes. It's not really working yet though.