Add replacement parameter to smbo

[SimonBlanke]

[SimonBlanke]

Sequence-model-based optimization algorithms in this package work by predicting the best approximate score from a list of all possible positions in the search-space. The current implementation never changes or modifies this list. The idea of the replacement parameter is to remove the positions that already have been evaluated from the list (after each iteration).

[SimonBlanke]

This should do the trick and some parameter-testing