Removed error on seeing table map event when slave is in SBR mode
  and switching temporarily to RBR mode to replicate the rows.


sql/log_event.cc:
  Settig binlog format to "row" on seeing a table map event.
  Resetting binlog format on error and seeing STMT_END_F.
sql/sql_class.h:
  Adding method to unconditially set binlog format to "row".
mysql-test/r/rpl_rbr_to_sbr.result:
  New BitKeeper file ``mysql-test/r/rpl_rbr_to_sbr.result''
mysql-test/t/rpl_rbr_to_sbr.test:
  New BitKeeper file ``mysql-test/t/rpl_rbr_to_sbr.test''