Sync zoneinfo database with tzdata2007j from elsie.

Sync zoneinfo database with tzdata2007j from elsie.

asia:           8.13 -> 8.14
northamerica:   8.19 -> 8.20
southamerica:   8.12 -> 8.13
zone.tab:       8.11 -> 8.12

From Paul Eggert's comments:

The following change affects near-future time stamps.

* Venezuela is changing their clocks on December 9 at 03:00, instead
  of the January 1 at 00:00 that we thought.  (Thanks to John
  Stainforth for the heads-up.)

The following change affects the country database, but not the time data.

* New links America/St_Barthelemy and America/Marigot, for the
  new countries St Barthelemy and St Martin (French part).
  (Thanks to Mark Davis for this.)

The following change affects commentary only.

* Add a comment about Iran's readoption of DST.
  (Thanks to Roozbeh Pournader for this.)