NAME
        SortGList -- Sort the current gel list, ordering its y,x coordinates.

   SYNOPSIS
        SortGList(rp)
                  A1

        void SortGList(struct rastport *);

   FUNCTION
        Sorts the current gel list according to the gels' y,x coordinates.
        This sorting is essential before calls to drawglist or docollision.

   INPUTS
        rp = pointer to the rastport structure containing the gelsinfo

   RESULT

   BUGS

   SEE ALSO
        initgels()  docollision()  drawglist()  graphics/rastport.h