code: func (t *Table) SetFixed(rows, columns int) *Table {
  	t.fixedRows, t.fixedColumns = rows, columns
  	return t
  }
docs: // SetFixed sets the number of fixed rows and columns which are always visible
  // even when the rest of the cells are scrolled out of view. Rows are always the
  // top-most ones. Columns are always the left-most ones.