mysql-test/r/derived.result:
  test of error handling in derived tables with UPDATE & DELETE
mysql-test/t/derived.test:
  test of error handling in derived tables with UPDATE & DELETE
sql/mysql_priv.h:
  opened tables counter added to avoid loop of tables calculating in lock_tables
sql/sql_acl.cc:
  opened tables counter added to avoid loop of tables calculating in lock_tables, here it is just for compatibility
sql/sql_base.cc:
  removed unneeded assignment
  opened tables counter added to avoid loop of tables calculating in lock_tables
  commentary fixed
sql/sql_derived.cc:
  mysql_derived made static
  variable res moved in place where it used
  priveleges written in correct place
sql/sql_handler.cc:
  opened tables counter added to avoid loop of tables calculating in lock_tables
sql/sql_parse.cc:
  mistyping in commentary fixed