updated wall collisions with test function
working on octree methods for adding/rmoving balls
added octree machinery for potential ball pairs
worked on octree implementation
completed octree implementation
fixed bugs with octree and added stopper collisions to octree ballWall search
worked more on stopper collisions
fixed up colors
fixed up background colo
updated some stuff pressure readings
begin work on graph axis
Merge branch 'octree'
added propper axis labels to graphs