Compare the contents of this CXlConstCell with another cell
int operator !=( const CXlOperBase& xlo ) const;
A reference to another CXlCell, CXlConstCell or CXlOper.
Returns TRUE if the value in this object is not equal to that in xlo; returns FALSE otherwise.
Note that CXlOpers are compared by type first and then by value. Thus a string containing "123" will not be equal to an integer containing 123.