REFAC: otbAppDocLink() macro to an inline function

Documentation/SoftwareGuide/Latex/WriteAnApplication.tex

...ChangeDetection/app/otbMultivariateAlterationDetector.cxx

...Classification/app/otbClassificationMapRegularization.cxx

...tions/AppClassification/app/otbComputeConfusionMatrix.cxx

...ions/AppClassification/app/otbComputeImagesStatistics.cxx

...ssification/app/otbComputeOGRLayersFeaturesStatistics.cxx

...Classification/app/otbComputePolylineFeatureFromImage.cxx

...tions/AppClassification/app/otbDSFuzzyModelEstimation.cxx

...ions/AppClassification/app/otbFusionOfClassifications.cxx

...Applications/AppClassification/app/otbImageClassifier.cxx

...cations/AppClassification/app/otbKMeansClassification.cxx

...tions/AppClassification/app/otbMultiImageSamplingRate.cxx

...lications/AppClassification/app/otbOGRLayerClassifier.cxx

...tions/AppClassification/app/otbPolygonClassStatistics.cxx

...plications/AppClassification/app/otbPredictRegression.cxx

...plications/AppClassification/app/otbSOMClassification.cxx

...pplications/AppClassification/app/otbSampleExtraction.cxx

...Applications/AppClassification/app/otbSampleSelection.cxx

...ations/AppClassification/app/otbTrainImagesClassifier.cxx

...Applications/AppClassification/app/otbTrainRegression.cxx