Changes in release 3.23.18
--------------------------
* Fixed a problem from 3.23.17 when choosing character set on the
client side.
* Added `FLUSH TABLES WITH READ LOCK' to make a global lock suitable
to make a copy of MySQL data files.
* `CREATE TABLE ... SELECT ... PROCEDURE' now works.
* Internal temporary tables will now uses compressed index when using
`GROUP BY' on `VARCHAR/CHAR' columns.
* Fixed a problem when locking the same table with both a `READ' and
a `WRITE' lock.
* Fixed problem with myisamchk and `RAID' tables.