sql/sql_delete.cc:
  invalidation moved before tables unlocking
  invalidation on multidelete error (if something changed)
sql/sql_parse.cc:
  invalidation moved to mysql_admin_table
  layout fixing
sql/sql_table.cc:
  invalidation moved to mysql_admin_table
sql/sql_update.cc:
  invalidation moved before tables unlocking
  invalidation on multiupdate error (if something changed)