Fixed race condition when using the binary log and INSERT DELAYED which could cause the binary log to have rows that was not yet written to MyISAM tables.


Docs/manual.texi:
  Changelog
mysql-test/r/null_key.result:
  Fix of testcase after changing optimizer to only use range keys if it would use a long part of the SAME key.
sql/sql_insert.cc:
  Fixed race condition with binary log and INSERT DELAYED
sql/sql_select.cc:
  Fixed bug when joining with caching