Small improvement to alloc_root

Add support for LIMIT # OFFSET #
Changed lock handling:  Now all locks should be stored in TABLE_LIST instead of passed to functions.
Don't call query_cache_invalidate() twice in some cases
mysql_change_user() now clears states to be equal to close + connect.
Fixed a bug with multi-table-update and multi-table-delete when used with LOCK TABLES
Fixed a bug with replicate-do and UPDATE

libmysql/libmysql.c

@@ -1524,6 +1524,7 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
 #endif
   init_sigpipe_variables
   DBUG_ENTER("mysql_real_connect");
+  LINT_INIT(host_info);
 
   DBUG_PRINT("enter",("host: %s  db: %s  user: %s",
 		      host ? host : "(Null)",