What (a) are the reasons for the increase in the Presidency’s Medium-Tterm Expenditure Estimate for travel and subsistence from R50 911 000 in the 2011-12 financial year to R67 610 000 in the 2012-13 financial year with regard to the Presidency’s budget, (b) does the line item Improvements in Condition of Service entail and (c)(i) amount has been allocated to the running of the Presidential Hotline for the 2011-12 financial year and (ii) steps have been taken to improve the resolution rate of the hotline?