Removed - Global/Database/Conditional_Group.php, Global/Database/Conditional_Value.php
These aren't used in the new conditional code

Global/Database/Constraint.php
- comments added and a method renamed.

Global/Database/DB.php
- added a getConditional method to pull a Conditional object

Global/Database/Datatype.php
- since setIsNull is pretty important, changed to return the object. This lets it get chained.

Global/Database/Table.php
- Put back checkConstraintTable function. Not sure why it was removed.

Global/ModuleController.php
- Construct now puts the Global Module object in the stack

Global/Settings.php
- code added for the Global module settings
- settings table is created if it does not exist

core/boost/*
- Added code for update