* libnautilus-extensions/nautilus-string-picker.c:
(nautilus_string_picker_initialize_class),
(nautilus_string_picker_initialize),
(nautilus_string_picker_destroy), (option_menu_activate_callback),
(nautilus_string_picker_set_string_list),
(nautilus_string_picker_get_text),
(nautilus_string_picker_set_text):
* libnautilus-extensions/nautilus-string-picker.h:
Changed string picker to use option menus instead of combo boxes.

* test/test-nautilus-widgets.c: (test_string_picker),
(string_picker_changed_callback):
Changed widget test program to exercise more string picker
functions.