BUG: change AVI computation 1/tan -> arctan

...eatureExtraction/otbAngularSecondMomentumTextureFunctor.h

Code/FeatureExtraction/otbContrastTextureFunctor.h

Code/FeatureExtraction/otbCorrelationTextureFunctor.h

Code/FeatureExtraction/otbDifferenceEntropyTextureFunctor.h

Code/FeatureExtraction/otbEntropyTextureFunctor.h

...tureExtraction/otbInverseDifferenceMomentTextureFunctor.h

Code/FeatureExtraction/otbLineSegmentDetector.h

Code/FeatureExtraction/otbLineSegmentDetector.txx

Code/FeatureExtraction/otbSumAverageTextureFunctor.h

Code/FeatureExtraction/otbSumEntropyTextureFunctor.h

Code/FeatureExtraction/otbSumVarianceTextureFunctor.h

Code/FeatureExtraction/otbTextureFunctorBase.h

Code/FeatureExtraction/otbVarianceTextureFunctor.h

Examples/FeatureExtraction/ExtractSegmentsByStepsExample.cxx

Testing/Code/FeatureExtraction/CMakeLists.txt

Testing/Code/FeatureExtraction/otbLineSegmentDetector.cxx

Testing/Code/FeatureExtraction/otbTextureFunctor.cxx

Testing/Code/FeatureExtraction/otbTextureImageFunction.cxx