lib(cycle)

   
	A configurable constraint that forces the existence of a Hamiltonian cycle in a directed graph.
	The constraint uses the ic and eplex libraries to achieve different levels of filtering. For more 
	details see cycle/4.
	Parts of the filtering algorithm have been inspired by or are implementations of ideas presented by
	John H.Hooker in "Rossi F., van Beek P., Walsh T. (Eds.), Handbook of Constraint Programming, 
	chap. 15. 2006 Elsevier.".
	
	The constraint will be refined and new filtering techniques will be added as time will allow to
	work on the subject.
	

