Stopping criteria

1. Stop when optimal solution is reached (discrete problems).
2. Stop when an accuracy of ACCgoal is reached.
3. When using CE with injection, a possible stopping criterion is to stop once a certain number of injections, Injmax say, is reached.

4. Stop after FEmax function evaluations
5. Stop when the overall optimal value found so far does not change for BESTmax number of iterations. (mostly for discrete problems)
6. ***more to come, e.g.number of injections, number of increases of N, number of time worst elite is same, when sigma is small enough, when relative error is small enough.