Use Warden test mode for testing logged-in users

Repeating the log in specs before every feature spec was eating up close
to half of the test time.
Replace client-side filter with active country in session #295, #304

Admins now set an active country and then manage orders as a PCMO from
that country would. This should solve most of the "forgetful" complaints
we've had about admin activity, along with allowing us to sort and
paginate everything easily and consistently server-side.

The filter was the most substantial bit of javascript, so I went ahead
and moved the other bits to where they are used. It's not as cleanly
extracted, but for infrequently-developed codebases like this, the
increased code locality is a win.
Extract partials from new response template
Paginate personal request history
Pagniate all order tables #304