Printing out diagrams of the sentences.

§1. This is where we could put an interpreter or compiler; we now have a nice tidy syntax tree to look at. Instead, we'll just print it out.

void Interpreting::go?Usage of Interpreting::go:
Program Control - §3(parse_node_tree *syntax_tree) {
    SyntaxTree::traverse(syntax_tree, Interpreting::diagram);
}

int sentence_counter = 1;

void Interpreting::diagram(parse_node *p) {
    if (Node::get_type(p) == SENTENCE_NT) {
        LOG("(%d) %W\n\n", sentence_counter++, Node::get_text(p));
        Node::log_subtree(DL, p);
        LOG("\n");
    }
}