Improve pso.py script

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Improve fitness function

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Add two results for testing

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>