These fields exist in the live database so migration should still work there.

This seems to be the preferred way to load extensions but FlaggedRevs doesn't support it for some reason, so we need to include it directly.

This seems to resolve the issue of mediawiki and smf sessions colliding, as mediawiki will no longer touch smf's session. The "loss of session data" error seems to still not be present.

Should go away if/when we switch to Auth remoteuser extension