What (a) are the categories of expenditure incurred for Subsistence and Travel (S&T) for each of her department’s programmes (i) in the 2014-15 financial year and (ii) since 1 April 2015 and (b) cost containment measures have been instituted to contain S&T costs, as per directive of the National Treasury, with respect to the (i) size of delegations, (ii) flight class and (iii) class of hotel room?