What (a) was the budget for the compensation of employees of each (i) national department, (ii) entity of any national department, (iii) organ of state and (iv) department of each of the provincial governments in the (aa) 2012-13, (bb) 2013-14 and (cc) 2014-15 financial years and (b) is the budget in each specified case for the 2015-16 financial year?