Trainable Weka Segmentation: comment redundant log message.
Trainable Weka Segmentation: cleanup code.
Trainable Weka Segmentation: remove commented code.
Trainable Weka Segmentation: remove calls to createInstanceInPlace.

Surprisingly, setting the values of DenseInstance is more expensive than creating a new one.

TODO: create a new Instance class that prevents so many calls to new() and memory duplications.