Imported dimensionality reduction module into OTB

...earning/DimensionalityReduction/include/SOMModelFactory.h

...rning/DimensionalityReduction/include/SOMModelFactory.txx

...nsionalityReduction/include/cbLearningApplicationBaseDR.h

...ionalityReduction/include/cbLearningApplicationBaseDR.txx

...ng/DimensionalityReduction/include/cbTrainAutoencoder.txx

...s/Learning/DimensionalityReduction/include/cbTrainPCA.txx

...s/Learning/DimensionalityReduction/include/cbTrainSOM.txx

Modules/Learning/DimensionalityReduction/otb-module.cmake