A variety of configuration changes for transitioning legacy BIS domains

A few of these changes involve a change to the primary domain of a site, which might (@jamiecobbett?) involve some database fu.


This site is not in the TNA at the [BIS location](http://webarchive.nationalarchives.gov.uk/*/http://www.iatraining.bis.gov.uk), but it is in the TNA at the [BERR location](http://webarchive.nationalarchives.gov.uk/*/http://www.iatraining.berr.gov.uk).