mysql-test/r/delete.result:
  Test case for bug in multiple-table-delete where some rows was not deleted
mysql-test/t/delete.test:
  Test case for bug in multiple-table-delete where some rows was not deleted
sql/item_subselect.cc:
  Code cleanup
sql/opt_range.cc:
  Code cleanup
sql/sql_delete.cc:
  Fixed bug in multiple-table-delete where some rows was not deleted
  This happend when the first table-to-delete-from was not the the table that was scanned.
  Fixed this by only doing 'delete-on-the-fly' for the first table.
  Fixed also some wrong error handling in multi-table-delete