What are the details of the (a) breakdown of the total amount paid by her department to purchase Limburg Farming Enterprise for the Communal Property Associations (CPA), (b) breakdown of the amount paid by the department to support the CPA towards input and infrastructure costs since the start of the CPA to date and (c)(i) size of the farm, (ii) types of farming taking place on the farm, (iii) productivity levels and (iv) challenges faced by the CPA?