code: def make_constructor_list(self, constructor_nodes, classname):
          
          if constructor_nodes == []:
              return
          self.add_text(['\n', 'Constructors',
                         '\n', '------------'])
          for n in constructor_nodes:
              self.add_text('\n')
              self.add_line_with_subsequent_indent('* ' + self.get_function_signature(n))
              self.subnode_parse(n, pieces = [], indent=4, ignore=['definition', 'name'])
docs: Produces the "Constructors" section and the constructor signatures
          (since swig does not do so for classes) for class docstrings.