rbdemo now filters out a bunch of stuff we don't want to keep in the

dump file. This includes guest user entries, review request visits,

the siteconfig, and unwanted extension entries.
When loading, we preserve the old siteconfig so that we don't end up

with stuff from a development server overwriting the stuff on

production.

Dumped the database and saw a bunch of stuff removed that was previously

there.
Made some changes to the settings, and then reset with the prior dump. Saw

that the siteconfig was preserved.