This file includes settings.php which puts out a couple of JS vars, so
headers already sent and as a result, this page dies and goes nowhere.
JS window.location setup as a failsafe to do the same in that event.
End point immediately after plugins is now previousFiles as plugins has
moved in the array order
Tacked ?updatedPlugins onto the URL so we can pick this up and know what
to also action in plugins-manager.php
