Added devLoss option, allow to compute dev loss

maca_common/include/ProgramParameters.hpp

maca_common/src/ProgramParameters.cpp

neural_network/include/GeneticAlgorithm.hpp

neural_network/include/MLP.hpp

neural_network/include/MLPBase.hpp

neural_network/include/NeuralNetwork.hpp

neural_network/src/GeneticAlgorithm.cpp

neural_network/src/MLP.cpp

neural_network/src/MLPBase.cpp

trainer/include/TrainInfos.hpp

trainer/src/TrainInfos.cpp

trainer/src/Trainer.cpp

trainer/src/macaon_train.cpp

transition_machine/include/Classifier.hpp

transition_machine/src/Classifier.cpp