Member sorting, db crap

Implemented basic sorting of members by title. ie. Admin, Mod or Staff.
If not specified or invalid, all members are returned. Also added
sorting via userRole and added DB-generated list items from Role table.
Scrapped previous connection schema for a more centralized approach. All
DB queries should include Connection.php (they pretty much did already).
Note: this section isn't complete. I broke MySQL while implementing the
sidebar and mindex stuff. I'll fix it later.