packRec()
 Copy a single row back to the current work area
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 Prototype

     ERRCODE packRec(
                          AREAP wa,
                          LONG lRecno,
                          USHORTP lpfWritten
                       )

 Arguments

     wa is a pointer to self.

     lRecno is the number of a record which has to remain within the
     file.

     lpfWritten is a pointer to a boolean flag indicating whether the
     record will remain within the file.

 Description

     packRec() copies a single row back to the work area and is called from
     within the pack() method.

 Default Behavior

     You must implement the default behavior of this method through a
     subclass.

 Implementation Notes

     .  Within the pack() method, call packRec() for each single row
        that you want to copy back to the original database file.

 Files  Header file is Rdd.api.