Set FTN::Packet FTSC Product Code to 1CFF in lib/FTN/Packet.pm
Update copyright year in lib/FTN/Packet.pm file.
Add reference to the FTN Packet FTSC documentation to lib/FTN/Packet.pm file.
Add reference to the FTSC Procduct codes to lib/FTN/Packet.pm file."

The FTSCPROD.016 file is the version that contains the FTSC product code
for FTN::Packet but it does not yet appear to be on the www.ftsc.org site,
so just adding the bare file name.
FTN::Packet::ToDo as of 26 December 2013.
Changes for v0.21
FTN::Packet v0.21

* develop:
  Changes for v0.21
  FTN::Packet::ToDo as of 26 December 2013.
  Add reference to the FTSC Procduct codes to lib/FTN/Packet.pm file."
  Add reference to the FTN Packet FTSC documentation to lib/FTN/Packet.pm file.
  Update copyright year in lib/FTN/Packet.pm file.
  Set FTN::Packet FTSC Product Code to 1CFF in lib/FTN/Packet.pm