Sync zoneinfo database with tzdata2007g from elsie.

Sync zoneinfo database with tzdata2007g from elsie.

africa:         8.8  -> 8.9
antarctica:     8.3  -> 8.4
australasia:    8.7  -> 8.8
europe:         8.10 -> 8.11
leapseconds:    8.3  -> 8.4
northamerica:   8.17 -> 8.18
zone.tab:       8.10 -> 8.11

From Paul Eggert's comments:

* Egypt switches the September 7, not September 28.  Thanks to Dirk
  Losch for this.

* Daviess, Dubous, Knox, Martin, and Pike Counties, Indiana, switch
  from central to eastern time in November.  This results in a zone
  split, and a new entry America/Tell_City is created for Perry County,
  which does not switch zones in November.

* South Australia, Tasmania, Victoria, and New South Wales are changing
  their DST rules effective next year.  DST will end the first Sunday in
  April at 03:00 and start the first Sunday in October at 03:00.  Lord Howe
  Island has a similar change.

* Several Antarctic station's rules weren't properly updated to account
  for this year's change to the New Zealand daylight saving rules.

* In zone.tab (sorry, I don't recall who sent in these changes):
** Dumont-d'Urville is a station, not a base.
** Correct the coordinates for Aruba, Cambridge Bay, London, Johnston.
** Give alternate spellings for Zaporozhye.

* Add spelling notes for Kiev, Uzhgorod, Zaporozhye.
  (Sorry, I forgot who wrote this.)

* Identify American time zone boundaries more carefully.
  (Sorry, I forgot who sent this in.)

* Improve historical notes for Howland, Baker, and Jarvis.

Additionally, this commit updates the "leapseconds" file to incorporate the
most recent International Earth Rotation and Reference Systems Service (IERS)
bulletin.