Fixed miscellaneous bugs
Added a class of OFS Operator definitions
Added a list of operators and their operator types
Added a method that retrieves the value of an operator type
Moved data operation constants to Enquiry_Field.php
Added data operation constants and modified internal field access levels
Required the file containing helper functions
Added a private variable that holds the name of an enquiry operation
Modifed teh way of accessing operators
Added a method that creates an OFS user information string