* libnautilus-extensions/nautilus-string-list.c:
	(nautilus_string_list_get_length):
	Allow for NULL to be treated as a zero length string list.

	* libnautilus-extensions/nautilus-string-picker.h:
	* libnautilus-extensions/nautilus-string-picker.c:
	(nautilus_string_picker_set_selected_string_index),
	(nautilus_string_picker_get_index_for_string):
	Two new functions to manipulate the string picker using indeces.

	* libnautilus-extensions/nautilus-text-caption.h:
	* libnautilus-extensions/nautilus-text-caption.c:
	(nautilus_text_caption_get_text), (nautilus_text_caption_set_text):
	Make the signature of get_text() use a const object.

	(nautilus_text_caption_set_editable): New function to change
	whether the caption's text is editable.