Sync zoneinfo database with tzdata2007f from elsie.

Sync zoneinfo database with tzdata2007f from elsie.

africa:         8.7  -> 8.8
australasia:    8.6  -> 8.7
northamerica:   8.16 -> 8.17

From Paul Eggert's comments:

Changes affecting current time stamps:

* Haiti no longer observes DST.  (Thanks to Stephen Colebourne for this.)

Changes affecting past and future time stamps:

* The Turks and Caicos switch at 02:00, not at 00:00, and have adopted
  US DST rules.  (Thanks to Chris Dunn and Brian Inglis for this.)

Changes affecting future time stamps only:

* New Zealand is extending DST, starting later this year.
  (Thanks to Colin Sharples and many others for this info.)

Changes affecting commentary only:

* The Caprivi Strip unofficially does not observe DST, but we currently
  have no further details.  (Thanks to Petronella Sibeene for this.)