Coppermine upgrader: should display link to upgrade database at end of upgrade

Nothing major, just a bit annoying:

Just upgraded a coppermine installation from 1.4.7 to 1.5.6 using virtualmin.

That resulted in a "Fatal error : " on the site, because the database hasn't been updated.

Either do that, or at least display link at end per instructions here:

http://documentation.coppermine-gallery.net/en/upgrading.htm

The update script

The updater is a script that will update your database and delete leftover files from outdated versions that are no longer used in your version. It can be accessed by clicking on the corresponding link inside the admin menu or by entering the URL into the address bar of your browser. You can run the updater by entering http://yoursite.tld/your_coppermine_folder/update.php into your browser's address bar.