Phenotype Convergence Terminator

The phenotype convergence terminator stops the optimization when there has been hardly any change in the best population individual (within percentual or absolute distance) for a certain time span, given in generations or fitness calls.
Be aware that, if the optimum individual is close to zero, it may happen that its phenotype values fluctuate due to numeric issues and do not easily converge in a relative measure.
Additional information is given for the superclass PopulationMeasureTerminator.