* src/boards/memory.c: (memory_destroy_all_items), (hide_card): cleanup, tries to solve
	  double free but it's not this yet.
	* src/gcompris/gameutil.c: (gcompris_find_absolute_filename):
	* src/gcompris/images_selector.c: (display_image), (parseImage),
	(read_dataset_directory): fixed bug where directory was considered as an image to load
	and caused the bad file dialog to be displayed.