A small functional change here was to eliminate an enormous "Usage"
headline that was already implicit from the tabs. It would have
complicated the refactoring to try to preserve it, and I don't think
anyone will miss it.
Extracting this template will give us a little more flexibility
to customize future tabs in the /activity page.
(imported from commit bdb0b7030c8ec1e20d4451dc059830c3f5ea7632)
Steve Howell