Added an interface for manipulating enquiry fields
Added a class for OFS user information
Added some important private variables
Added a method that reads data from private user properties
Added a method that writes data to private user properties
Added a method that reads a given property from default user properties
Added a method that reads a given property from instance specific user properties
Added a method that write a given property to default user properties
Added a method that write a given property to instance-specific user properties
Added a method that write a given property to instance-specific user properties
Added a method that turns on and off use of default user information
Added a method that checks whether to use default user information
Added some enquiry data operation constants