Report all surviving configurations from postselection

[TheIronBorn]

Often times postselection has a handful of surviving configurations and it can be useful to see all such configurations after the postselection finishes. Just as irace does after a standard iteration

[MLopez-Ibanez]

Hi @TheIronBorn,

Unfortunately, @leslieperez , who implemented this part of the code, is too busy to work on this. I have never used this code myself and I'm too busy working on other parts of irace. If you wish to implement it yourself, please send a pull request and I will be happy to review it.

Another option would be to implement postselection in a completely new package (or in Python, see: https://github.com/auto-optimization/iracepy) reusing as much as you wish from the irace package. If you need us to export additional functions, I'm happy to do so. If you decide to do so, I'll be happy to remove the code from irace and direct people to use your package instead.