8.9.3 computeWCS(self,pixelSize,sizeX=[],sizeY=[],minmax=[]):

computeWCS $<$ Image: $<$ BoaMapping.py

        DES: fill main WCS keywords according to pixel size and map limits
        INP: (int) pixelSize = size of pixel in acrsecond
             (float) sizeX = map limits in azimuth, in arcsecond
             (float) sizeY = map limits in elevation, in arcsecond
             (float) minmax = [minAzoff,maxAzoff,minEloff,maxEloff] in this order