mlxtend

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Similar to the recently added fixed_features parameter that was added to the SequentialFeatureSelector (see #578), a fixed_features param could be added to the ExhaustiveFeatureSelector as well. This would allow users to specify a fixed set of features, for example, based on domain knowledge.

I have created a new pull request with an updated version that follows the steps in sequential feature selection #651 but it still needs to be modified.