1) undoing my fix for BUG#8055 "Trouble with replication from temporary tables and ignores"

and fixing it another way (per Monty; a simpler solution which does not increase the number
of binlog events is to always execute DROP TEMPORARY TABLE IF EXISTS on slave). A new test rpl_drop_temp.
2) fixing BUG#8436 "Multiple "stacked" SQL statements cause replication to stop" by setting
thd->query_length to the length of the query being executed, not counting the next queries
if this is a multi-query. Should also improve display of SHOW PROCESSLIST. A new test rpl_multi_query.

mysql-test/t/rpl_multi_query.test

@@ -0,0 +1,26 @@
+# Test for BUG#8436: verify that a multi-query (i.e. one query
+# containing several queries (assuming client has
+# CLIENT_MULTI_STATEMENTS) will be binlogged ONE-query-per-event (not
+# one binlog event containing all queries)
+
+source include/master-slave.inc;
+--disable_warnings
+drop database if exists mysqltest;
+--enable_warnings
+create database mysqltest;
+
+delimiter /;
+create table mysqltest.t1 ( n int);
+insert into mysqltest.t1 values(1)/
+insert into mysqltest.t1 values(2);
+insert into mysqltest.t1 values(3);
+insert into mysqltest.t1 values(4);
+insert into mysqltest.t1 values(5)/
+delimiter ;/
+sync_slave_with_master;
+select * from mysqltest.t1;
+connection master;
+--replace_column 2 # 5 #
+show binlog events from 79;
+drop database mysqltest;
+sync_slave_with_master;