added the LTuple class
added l_tuple_give_item()
added L_TUPLE_SIZE() and L_TUPLE_ITEM()
fixed LTuple destructor
moved the PACK_KEY enum to lpackprivate.h
added code to pack/unpack tuples
added L_OBJECT_CLASS()
added l_object_class_name()
added some debug infos in test_base
fixed valgrind suppressions