[Mediawiki-l] User migration

[Platonides]

Drop the tables created by MediaWiki 1.18 (drop & recreate the db).
Import the old database in mysql.
Run maintenance/update.php, so that MediaWiki 1.18 updates the db to the
latest schema.

You will want $wgMysql5 = false;
Beware of
http://www.mediawiki.org/wiki/Manual:Backing_up_a_wiki#Latin-1_to_UTF-8_conversion
you may need to add --default-character-set=latin1 to the mysqldump command.