Challenger identical with Incumbent

[Marius Lindauer]

We can again sample the incumbent as a challenger. I have observed this in particular in the beginning with the default configuration. We should check why this happens.

Since incumbent and challenger are the same, the intensification method will return that the challenger has changed (to the same incumbent again). This can be very confusing for users.

[Matthias Feurer]

Observed this as well.

[Marius Lindauer]

right now, I have fixed this by a simple if statement at the beginning of intensification to skip a configuration if it is the same as the incumbent. Is this sufficient?