- Decrease "slave_open_temp_tables" during reopen of truncated table.
 - Add test "rpl_trunc_temp" 


sql/sql_delete.cc:
  Decrease "slave_open_temp_tables" after temporary table has been closed, it will be
  increased again when the temp table is reopened after it's been truncated.
mysql-test/r/rpl_trunc_temp.result:
  New BitKeeper file ``mysql-test/r/rpl_trunc_temp.result''
mysql-test/t/rpl_trunc_temp.test:
  New BitKeeper file ``mysql-test/t/rpl_trunc_temp.test''