Create a setup wizard for first-time setup

[samilliken]

Create a setup.php script that will guide the user through the initial setup of a system. It should call the original files and pass a parameter that is checked in PHP and disable the inclusion of the style portions of the header, sidebar, and page definitions. It should cycle through the following entry screens, in this order:

Configuration
Departments
Data Centers
Cabinets

At the end, we'll link to the main page of the wiki, and state that only the bar minimum components have been set up. Consult the wiki for more information about additional features.