Write a setup wizard that replaces the manual wiki-data.sql editing and import. We should have the following setup procedure:

- Get the recommended environment ready (JBoss AS, MySQL)
- Deploy the wiki-ddl.sql on a new database
- Deploy the wiki.war on the appserver
- Open http://server/wiki/ and go through the setup wizard

The wizard will first import the minimum dataset (guest/admin users, roles, start page) and then ask the usual setup questions (site base URL, etc.). Depending on the future of the plugin API, it could also optionally allow you to configure some plugin defaults so you don't have to go into the Admin screen to change them after the install. Also, we can offer prepackaged datasets for certain use cases that can be imported with the wizard, e.g. "Help Documents", "Blog Website", "Forum Website".