COMP: itkOptBSplineInterpolateImageFunction.txx correction for std::complex pixel type (ResampleSLCImage testing)

WRG: Suppress ITK itkOptBSplineInterpolateImageFunction.txx:791: warning: converting to 'unsigned char' from 'double'

WRG: Suppress otbossimplugins warning (static_cast) and add virtual destructor for SensorParams Sensor SarSensor classes

WRG: Suppress warning comparaison between signed and unsigned values in BSplineScatteredDataPointSetToImageFilter class. Todo : send this correction to ITK project.