bugfix in BAC_NPP_NS_Selector.m (disallow extended class -1)
bugfix in BAC_NPP_NS_Selector.m (disallow extended class -1)

TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline,TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline,TWOEARS/identification-training-pipeline,TWOEARS/identification-training-pipeline,TWOEARS/identification-training-pipeline,TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline,TWOEARS/identification-training-pipeline,TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline,TWOEARS/identification-training-pipeline,TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline,TWOEARS/identification-training-pipeline,TWOEARS/Auditory-Machine-Learning-Training-and-Testing-Pipeline