VVVdouble & getLikelihoodArray(const Node *parent, const Node *neighbor) { return _likelihoods[parent][neighbor]; }
VVdouble & getLikelihoodArray()	{	return _leafLikelihood;	}
		VVVdouble & getLikelihoodArray(const Node *parent, const Node *neighbor)		{			return _likelihoods[parent][neighbor];		}