Change internal list type of CascadeClassifier to LinkedList
Decrease number of variables tossed around
Simplify updateWeights logic
Improve output in selectAndTrainWeakClassifier
Vastly improve training time

Break the loop over files in selectAndTrainWeakClassifier if we already
know that this feature is not the best one. Reduces runtime of the
function - which is the main time hog in the training - by 30% to 80%.