Changed the simple collision algorithm
Kd-Trees implemented. For testing reasons implemented a time measerment
for the collisions
Changed spaces with tabs, changed one comment and set the collision algorithm to the previous one
Implemented a rather ugly way for testing the correctness of kd-trees (Since it is just for testing I hope it is okay).
changed all 'locations' of the electric and magnetic field as well as the current.
changed the "location" of the particles
changed all 'locations' of the particle