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 REFAC : replaces the UnaryImageFunctor with the new FunctorFilter (apply log function to the input image) in otbDynamicConvert

For now complex pixel types are not supported by Convert and DynamicConvert
applications (see switch/case in the generic DoExecute method). This commit just
document this limitation.

Note that the ExtractROI application can be used to convert image from/to
complex image.

STY: Change ITK_OVERRIDE for override in whole code (find Modules -type f -exec sed -i 's/ITK_OVERRIDE/override/g' {} +)