Rebase to 2012b
    
    - Changes to zones for Antarctica stations
    - Armenia abolished DST in 2012 and forward
    - Cuba enters DST on 31st March
    - Falkland Islands will stay on permanent Summer Time
    - New zone for Creston Valley, Canada, which differs from Dawson
      Creek in past stamps.  Changes to historical stamps in Canada.
    - Last year, Tokelau skipped over the date line together with Samoa