Sync zoneinfo database with tzdata2006o from elsie.

Sync zoneinfo database with tzdata2006o from elsie.

antarctica:     8.2 -> 8.3
northamerica:   8.9 -> 8.10
southamerica:   8.5 -> 8.6

From Paul Eggert's comments:

* Changes affecting current and future time stamps.

  Cuba has ended its three years of permanent DST.
  (Thanks to Jesper Norgaard Welen for this.)

* Changes affecting past time stamps.

  Many transitions in Chile from 1918 through 1998 have been updated
  to reflect <http://www.horaoficial.cl/horaof.htm>.  (Thanks to
  Jesper Norgaard Welen for this.)  This also affects Palmer base
  in Antarctica.  I also updated some incorrect rules for use of
  Argentina daylight saving rules at Palmer before 1982.

* Changes affecting commentary only.

  The URLs for Paraguay's daylight saving decrees have been updated.
  (Thanks to Jesper Norgaard Welen and Carlos Raul Perasso for this.)