Add a page to show the latest evaluations for the entire server
Fix adding jobset inputs
Remove garbage from Users.pm
On build pages, provide a link to the build's first eval
Also show number of evaluations of which a build is a part
Remove the related builds tab

You can now just click on the evaluation link on the first tab to see
all builds in the same jobset.  This also makes rendering build pages
quite a bit faster for jobsets like Nixpkgs.
Allow showing all evaluations that contain a given build