Many thanks to:
	Nigel de Silva for all the ideas on how to use arrays effiecently
	Florian Leitenstorfer for a bug report on MackChainLadder
	Beat Huggler for comments on MunichChainLadder
	Daniel Murphy for comments on MackChainLadder
	Mark Hoffmann for a bug report on MackChainLadder
	Christophe Dutang for ideas and code for utility triangle functions
	Stefan Pohl for comments on tail factors with MunichChainLadder
	Ben Escoto for providing a patch to a bug on returning latest incomplete triangle positions.
	Przemyslaw Sloma for reporting a bug report on MackChainLadder