Restored return_bookmark functionality to Users
Merge branch '1.8.1' of github.com:/AppStateESS/phpwebsite into 1.8.1
Restored URL pushing and popping
Global/Database.php
- Table prefix was not getting set from config.php file

Global/Database/Resource.php, Global/Database/Table.php 
- Moved addfield methods out of resource
Merge branch '1.8.1' of github.com:AppStateESS/phpwebsite into 1.8.1
Global/Database.php
- added missing table prefixing

Global/Database/Table.php, Global/Database/Resource.php
- Moved methods dealing with fields out of resource and into Tables.