* Added privilege level start/end columns
Added 2 new columns to the users table to indicate when a users
privilege level date / time was recognised and when the privilege level
should end.
* Updated database header
Always forget about the database header file...
* Added priv level maintenance script
Added a bash maintenance script that can be run on a scheduled basis
that will demote privileged users that have the end times on the
accounts that are prior to the date/time the script is executed.
* Added donations table
Added donations table to db for tracking user donations
