version that doesn't depend on numpy
removed unneeded files
changed name of main script. Use deque for faster group ops

engine is now called optboid, optboids.py is now called simulation. Run
optboid.py. Also used collections.deque for slightly faster operations
in boid grid structure when adding groups of boids to a search result.
Cleaned up the simulation to be much more stabled, changed boundary conditions
Minor cleaning