ADD: PCA and MNF functionalities

Code/BasicFilters/otbHorizontalSobelVectorImageFilter.h

Code/BasicFilters/otbLocalActivityVectorImageFilter.h

Code/BasicFilters/otbNoiseEstimatorVectorImageFilter.h

Code/BasicFilters/otbSobelVectorImageFilter.h

...sicFilters/otbUnaryFunctorNeighborhoodVectorImageFilter.h

...cFilters/otbUnaryFunctorNeighborhoodVectorImageFilter.txx

Code/BasicFilters/otbVerticalSobelVectorImageFilter.h

Code/Hyperspectral/otbMNFImageFilter.h

Code/Hyperspectral/otbMNFImageFilter.txx

Code/Hyperspectral/otbPCAImageFilter.h

Code/Hyperspectral/otbPCAImageFilter.txx

Testing/CMakeLists.txt

Testing/otbHorizontalSobelVectorImageFilter.cxx

Testing/otbHyperTests1.cxx

Testing/otbLocalActivityVectorImageFilter.cxx

Testing/otbMNFImageFilter.cxx

Testing/otbPCAImageFilter.cxx

Testing/otbSobelVectorImageFilter.cxx

Testing/otbVerticalSobelVectorImageFilter.cxx