Add script to auto-config a site and generate mappings,

To config a site in the general case (assuming not many exceptional circumstances), one needs (a) an indicative redirection date, (b) a domain, and (c) an organisation. Everything else can be generated, for human review.

This script is a first attempt at automating a site configuration, to accommodate a list of organisations and sites, so that the bulk of the config work can be batched up front. It will also run a homegrown sitemap of the source site, attempting to acquire urls, for the subsequent step of determining significant query string parameters, with the side artifact result of a list of urls for the site.