4 * add list mode to allow nodes to be inserted in any arbitrary location
5 * add "*_hash_iterate()" function
6 * add flags argument to *_list_del() that allows the listptr to be set
7 to the previous or next element
8 * add a generic pointer type to replace *_listptr_t and *_hashptr_t ???
15 *_list_next => *_listptr_next()
16 *_list_prev => *_listptr_prev()
17 *_hash_next => *_hashptr_next()
18 * start using "*_list_t" and "*_hash_t" instead of "*_list_t *" and
20 * add prefixes to structure member field names