Node Infection Changes

Linking made so that only infected nodes can link to other nodes.
Infections pulse every 10 seconds to infect surrounding nodes.
Surrounding nodes are all 1 space away from infected node, resulting in
26 possible spaces that can be infected.
Node spacing made wider so less clustered.
Links made with bezier curves with 1 control point at the mid point
between two nodes pushed out by the cross product of the connecting line
and a random euler angle.