field does not work

Fix to prevent MyISAM from reading data from NULL BLOB.
Fix to make record comparison independent of values of unused bits in
record.
Updating binlog positions in tests.


mysql-test/extra/rpl_tests/rpl_multi_query.test:
  Binlog position change
mysql-test/extra/rpl_tests/rpl_stm_charset.test:
  Binlog position change
mysql-test/include/show_binlog_events.inc:
  Binlog position change
mysql-test/r/binlog_stm_binlog.result:
  Result change
mysql-test/r/binlog_stm_ctype_ucs.result:
  Result change
mysql-test/r/binlog_stm_insert_select.result:
  Result change
mysql-test/r/binlog_stm_mix_innodb_myisam.result:
  Result change
mysql-test/r/ctype_cp932_binlog_stm.result:
  Result change
mysql-test/r/ndb_binlog_multi.result:
  Result change
mysql-test/r/rpl_known_bugs_detection.result:
  Result change
mysql-test/r/rpl_loaddata.result:
  Result change
mysql-test/r/rpl_loaddata_s.result:
  Result change
mysql-test/r/rpl_ndb_charset.result:
  Result change
mysql-test/r/rpl_ndb_extraCol.result:
  Result change
mysql-test/r/rpl_ndb_log.result:
  Result change
mysql-test/r/rpl_ndb_multi.result:
  Result change
mysql-test/r/rpl_rbr_to_sbr.result:
  Result change
mysql-test/r/rpl_rotate_logs.result:
  Result change
mysql-test/r/rpl_sp.result:
  Result change
mysql-test/r/rpl_stm_charset.result:
  Result change
mysql-test/r/rpl_stm_flsh_tbls.result:
  Result change
mysql-test/r/rpl_stm_log.result:
  Result change
mysql-test/r/rpl_stm_max_relay_size.result:
  Result change
mysql-test/r/rpl_stm_multi_query.result:
  Result change
mysql-test/r/rpl_stm_reset_slave.result:
  Result change
mysql-test/r/rpl_stm_until.result:
  Result change
mysql-test/r/rpl_truncate_7ndb.result:
  Result change
mysql-test/r/user_var-binlog.result:
  Result change
mysql-test/t/binlog_stm_mix_innodb_myisam.test:
  Binlog position change
mysql-test/t/ctype_cp932_binlog_stm.test:
  Binlog position change
mysql-test/t/mysqlbinlog.test:
  Binlog position change
mysql-test/t/mysqlbinlog2.test:
  Binlog position change
mysql-test/t/rpl_sp.test:
  Binlog position change
mysql-test/t/rpl_stm_flsh_tbls.test:
  Binlog position change
sql/log_event.cc:
  Emptying the record entirely since it appears MyISAM reads blob column
  data even when they are NULL.
  
  Adding code to set unused bits of the records before doing a comparison,
  and restoring the original values after. Setting the unused bits is necessary
  since NDB does not set them correctly, and resetting them afterwards is needed
  because MyISAM compares the record with the one located when updating
  or deleting it.
mysql-test/r/rpl_row_basic_11bugs-master.opt:
  New BitKeeper file ``mysql-test/r/rpl_row_basic_11bugs-master.opt''
mysql-test/r/rpl_row_basic_11bugs-slave.opt:
  New BitKeeper file ``mysql-test/r/rpl_row_basic_11bugs-slave.opt''