Generates a list of node lists for the last level of the CAT decision tree
create_last_level(nodes_prev, nres, level, prob_array, SE)list of node lists of the nodes from the previous level
vector of number of possible responses for every item
last-level number (equals the length of the test plus one)
3-D array of probability responses. Dim 1 represent items, dim 2 represent evaluated ability levels and dim 3 represent possible responses
minimum standard error of the ability level
A list of lists. Each of these lists represent a node of the last level of the decision tree