Allow multiple statistical classes to be assigned to patron records
Currently only one Statistical class can be assigned to the patron record. It would be helpful to allow multiple statistical classes to be assigned. Sometimes a patron can be registered while multiple programs occur, such as when a child is registered for a 0-5 campaign, and then later they may participate in another reading program. Both codes would be used to track each type of program. Currently, we have to use the notes field to do some tracking, and the notes field isn't as friendly since it is free text.
