Changes in release 3.21.18
--------------------------
* Issue error message if client C functions are called in wrong
order.
* Added automatic reconnect to the `libmysql.c' library. If a write
command fails, an automatic reconnect is done.
* Small sort sets no longer use temporary files.
* Upgraded `DBI' to 0.91.
* Fixed a couple of problems with `LEFT OUTER JOIN'.
* Added `CROSS JOIN' syntax. `CROSS' is now a reserved word.
* Recoded `yacc'/`bison' stack allocation to be even safer and to
allow MySQL to handle even bigger expressions.
* Fixed a couple of problems with the update log.
* `ORDER BY' was slow when used with key ranges.