* clutter/clutter-model.[ch]: Add a ::copy() virtual function
for copying iterators.
* clutter/clutter-list-model.c:
(clutter_list_model_iter_copy),
(clutter_list_model_iter_class_init): Implement the ::copy()
function inside the ListModel iterator subclass.
* clutter/Makefile.am:
* clutter/clutter.h:
* clutter/clutter-list-model.[ch]: Complete the ClutterModelDefault
to ClutterListModel rename by renaming the source files