	Requirements for l0 collection class (abstract)

1) Store l0 collection data, including a l0 file object pointer, in an extensible format.

2) Initialize the l0 collection with a given PCF file logical and packet size.  If successful, disallow further 
   attempts to initialize the collection.  If not successful, write an appropriate entry to the diagnostics file.

3) Retrieve the next packet in the l0 collection.  If the current l0 file in the collection contains no more packets,
   close that file and open the next 
