Sync zoneinfo database with tzdata2007a from elsie.

Sync zoneinfo database with tzdata2007a from elsie.

africa:         8.5  -> 8.7
australasia:    8.4  -> 8.5
backward:       8.2  -> 8.3
europe:         8.6  -> 8.7
northamerica:   8.10 -> 8.11
southamerica:   8.6  -> 8.8
zone.tab:       8.6  -> 8.8

From Paul Eggert's comments:

* Changes affecting future time stamps.

  - The Bahamas also observe the new US DST rules this year.
    (Thanks to Sue Williams for this.)

* Changes affecting TZ names, to reflect typical English practice better.
  The old names are still supported, in the 'backward' file.

  - Rename Africa/Asmera to Africa/Asmara.

  - Rename Atlantic/Faeroe to Atlantic/Faroe.

* A new zone Australia/Eucla, covering the Eucla area.  (Thanks to
  Alex Livingston for this.)

* Changes affecting old time stamps.

  - The 1982 transition for Pacific/Easter occurred Mar 13, not Jan 18.
    Also, the pre-1932 time stamps are now labeled EMT, not MMT, since
    they are not Mataveri Mean Time.  (Thanks to Jesper Norgaard Welen
    for this.)