Append/prepend commands. Introduce new storage commands "append" and "prepend" for atomic value modification. They follow generic storage commands interface as described in doc/protocol.txt: <command name> <key> <flags> <exptime> <bytes>\r\n <data block>\r\n Current implementation involves memcpy() twice to combine values on writing (i.e. full resulting value are copied), but truly atomic (and even threadsafe).

/* associative array */
void assoc_init(void);
item *assoc_find(const char *key, const size_t nkey);
int assoc_insert(item *item);
void assoc_delete(const char *key, const size_t nkey);
void do_assoc_move_next_bucket(void);
uint32_t hash( const void *key, size_t length, const uint32_t initval);