list->clone (ul_oocbs)

	list.s.r = clone(list.s.r)

	This function is used as a constructor to create a copy of a
	pre-existing instance of the List class. The new instance will
	be identical to the original instance in all respects, except
	that it will use different storage - therefore operations on the
	original instance will not affect the new instance, and vice-versa.

	list              a pointer to the list (structure of type List)

	This function returns:

	a pointer to the newly-created instance of the List class upon
	success, or a null pointer upon failure to allocate virtual memory.

	Use of this class requires the following header files:

	list.h

	Related functions:

	create_List()     the constructor for instances of the List class

	C/C++ usage:

	#include "list.h"
	List*	list_1;
	List*	list_2;

	list_2 = (*list_1->clone)(list_1);