* docs/website/sommaire.html: added an explanation on languages in GCompris
	* src/boards/machpuzzle.c: (minigolf_create_item),
	(create_machine_item), (minigolf_move): fixed compile warning
	* src/boards/memory.c: (end_board), (memory_destroy_all_items): fixed a crash,
	 tux_memory was not set to NULL and was reused.
	* src/gcompris/config.c: (item_event_ok): implemented instant fullscreen.
	* src/gcompris/gcompris.c: (init_background), (setup_window),
	(gcompris_set_fullscreen), (gcompris_exit), (gcompris_init): implemented instant fullscreen.
	* src/gcompris/gcompris.h: implemented instant fullscreen.