Browse interface needed in addition to search

[martindholmes]

It would be useful to have a drill-down browsing interface so you could choose e.g.

year -> county -> city -> record list
county -> city -> year -> record list
trade -> county -> city -> year -> record list

etc. All of this can of course be done via the search, but many users will find a browse interface more appealing, and also it will provide a mechanism by which web crawlers and archivers can find their way to all the record pages, meaning that the whole site could be archived by a crawler minded to do it. We should also provide a standard sitemap.xml file for this purpose, of course.