Abort Optimization flow confusing; IsFrontier does not appear correct

[Groostav]

the Abort optimization flow is more confusing than it needs to be; offerSimulationResult and offerErrorResult can be merged into the same method.

Also, isFrontier is not correct:

1. create a simulation with 2 variables and an expensive constraint
2. start the optimization for 2 points

expected: some point, even if all points are infeasible, is frontiner actual: no points are infeasible.

[Groostav]

fixed in 4a7e775ebe2b2d0e7d7ad1490bf86de629457cf6

[Groostav]

this was closed erroneously