The result of put_everything_together() function is writen in a file.
        Takes:
            * output_name * - name for the output file

def write_final_draw_file(self, output_name):
        """The result of put_everything_together() function is writen in a file.
        Takes:
            * output_name * - name for the output file
        """
        finalsvg = open(output_name+".svg","w")
        finalsvg.writelines(self.final_molecule)
        finalsvg.close()