logand: Constructor for logical and node
In mickash/Adaptive-Bayesian-Networks: Adaptive Bayesian Networks.

Constructor for logical and node

1	logand(index, name, values, parents, pvals, params, params2)

`index`	integer giving the index of the node
`name`	string giving name of node
`values`	vector of strings giving names of values of node
`parents`	vector specifying indices of parents of node
`pvals`	vector specifying number of values for each parent of node
`params`	matrix specifying values of parents for logical-and.