ENH: set doc example to the nex framework for Utils appli

Applications/Utils/otbBandMath.cxx

Applications/Utils/otbColorMapping.cxx

Applications/Utils/otbCompareImages.cxx

Applications/Utils/otbConcatenateImages.cxx

Applications/Utils/otbConcatenateVectorData.cxx

Applications/Utils/otbConvert.cxx

Applications/Utils/otbDEMConvert.cxx

Applications/Utils/otbExtractROI.cxx

Applications/Utils/otbKmzExport.cxx

Applications/Utils/otbMultiResolutionPyramid.cxx

Applications/Utils/otbOSMDownloader.cxx

Applications/Utils/otbQuicklook.cxx

Applications/Utils/otbReadImageInfo.cxx

Applications/Utils/otbRescale.cxx

Applications/Utils/otbSmoothing.cxx

Applications/Utils/otbSplitImage.cxx

Applications/Utils/otbVectorDataExtractROIApplication.cxx

Applications/Utils/otbVectorDataSetField.cxx

Applications/Utils/otbVectorDataTransform.cxx