Adding error functions into main error messages
Adding error functions into main error messages

nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml