Adds the given MathObject, sym, to the symbol table,
associating it with the given name (which is probably
the name of the symbol or that name transformed to lower
case, but it doesn't have to be).
Add the specified CoordinateRect to this DisplayCanvas, filling the entire canvas,
and with background color equal to the background color of the canvas.
Add a row number variable (from the getRowNumberVariable() method) and
a column variable for each column (from the getColumnVariable() method)
to the parser.