OpenEXR deep image fixes -- must rename or suppress some attributes
whose careless copying from one file to another will cause problems.
ImageBufAlgo::flatten() and 'oiiotool --flatten'
turn deep images into flat images by depth-compositing the samples
within each pixel.
Better hints to find openjpeg
Better reference match for newer certain versionf of libgif
FITS: try to be sensible for 1-D images