JOHANNESBURG – The greatest among us are those who choose to transform negativity into something positive and Nelson Mandela is a prime example of someone who did this. He transformed the negativity that was associated with apartheid into unity.It is true that there were many times in the last 30 years when it seemed as though the flame of unity was flickering. But it is also true that that flame never went out. In fact, every so often, it has burned brightly.Last Saturday this flame was especially strong during the singing of the national anthem ahead of the Springboks taking on Ireland…