Jobset page: Show last evaluation time
Fix indentation
Job page: Remove channel tab
Job page: show queued as well as running builds
Job page: Remove "Latest builds (latest evaluation)"

It was kind of confusing since there are two other "latest builds"
tabs/sections.
Job page: Put latest builds on top

Also, rename the "Latest builds" tabs to prevent confusion.
Some unnecessary job names
Generalize lazy tabs
Show an error message if tab loading fails
Set a 500 HTTP status on errors
Jobset page: Load the jobs and status tabs on demand

This makes the jobset page much smaller and faster.  (E.g. for
nixpkgs:trunk, this page was ~2.5 MB.)
Clear failed builds etc.: Redirect back to the referrer

Would be better to do this AJAX style though.
Add a search feature

This allows searching for projects, jobsets or jobs by name or
description.
Search: Don't return hidden projects/jobsets
Search: Mark disabled projects/jobsets/jobs
Search: Limit the number of results
Show current query in the search box