Quickmail upgrade function misnamed

When upgrading to a new version of Quickmail, the following error is generated:

Upgrade function quickmail_upgrade was not available in [path]/blocks/quickmail/db/mysql.php

This is simply resolved by renaming the function email_upgrade to quickmail_upgrade. After that, upgrading works like a charm.

The function also exists in the postgres7.php file, and should (I presume) also be renamed there.