refactoring of SGN::Image in conjunction with parent class CXGN::Image.
refactoring of SGN::Image in conjunction with parent class CXGN::Image.

solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn