Fix #268 User pages in the admin section

I've fixed the links, but also implemented:

 - viewing user details
 - editing of all user details
 - deleting a user
I wanted the page title to make sense, so needed some separation otherwise they read "DDD East Anglia Admin Users". As it is needed for every page, this seemed like the best place, rather than adding a leading " - " onto each title in each page.