[Bug 39417] New: Display duration instead of 'Ended' time

https://bugs.winehq.org/show_bug.cgi?id=39417

Bug ID: 39417
           Summary: Display duration instead of 'Ended' time
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

For Jobs and Tasks the website shows the 'Ended' time but this is not very
practical. Developers would likely be much more interested in the time it took
to run the job/task. So all this does is force them to do that calculation
themselves.

The (slight) difficulty is mostly that the relevant pages use a base class that
builds the HTML from all the selected fields. So the framework would need to be
modified to let subclasses either provide their own 'virtual columns' with the
corresponding header and content. Alternatively, in this case we could make do
with letting them replace the column's header and content.