This method extends the names of the nodes to the given maximum and maintains the order of the nodes in each slice, so as to plotting the nodes in all slices relative to their homonyms in the first slice.
expand_time_nodes(name, acc, max, i)
the extended names
the names of the nodes in the t_0 slice
accumulator of the resulting names in the recursion
number of time slices in the net
current slice being processed