What is the total amount in rand that was spent on flights by (a) senior management and (b) board members of the entities reporting to her) with reference to the (i) date of the trips, (ii) person(s) who travelled, (iii) purpose of the trip, (iv) duration and (v) destination in (aa)(aaa) 2014, (bbb) 2015 and (ccc) 2016 and (bb) up to 1 May 2017?