Moved Label change events close to input

...fr/univ_lille/cristal/emeraude/n2s3/core/InputLayer.scala

...e/cristal/emeraude/n2s3/core/event/LabelChangeEvent.scala

...ristal/emeraude/n2s3/core/event/LabelChangeResponse.scala

...meraude/n2s3/features/io/report/BenchmarkMonitorRef.scala

...tal/emeraude/n2s3/features/learning/BackPropagation.scala

.../emeraude/n2s3/features/learning/SpikingSquareError.scala

...cristal/emeraude/n2s3/features/learning/SquareError.scala

...raude/n2s3/features/learning/SupervisedSTDPLearning.scala

...cristal/emeraude/n2s3/features/logging/LabelMonitor.scala