I have a version of omeka vintage 2008 that was used for testing.
I want to uninstall the whole installation. I do not have to save the database.
To completely remove the omeka installaton, do I simply remove all the files and directories in the application directory?
That's the first step. If you don't care about the database, you'll probably want to delete the entire database, too. You should be able to do that through PHPMyAdmin in the CPanel.
If this was created by a 1-click install from Dreamhost, you might need to look in
db.ini to get the database name and credentials before you delete all the files.