Sync zoneinfo database with tzdata2008e from elsie.

Sync zoneinfo database with tzdata2008e from elsie.

africa:         8.13 -> 8.15
asia:           8.21 -> 8.22
europe:         8.14 -> 8.17
leapseconds:    8.5  -> 8.6

From Arthur David Olson's comments:

* Changes for Mauritius in the "africa" file based on messages from
  Steffen Thorsen and Alex Krivenyshev: Mauritius will start and end
  their DST a few days earlier than previously announced
  (new start date: 2008-10-26, new end date: 2009-03-31).

* A fix for a typo in the "europe" file from Jesper Norgaard Welen (only
  affects 1945 time stamps).

* Changes to the "leapseconds" file to reflect the IERS announcement
  of a positive leap second at the end of 2008.

* Data file URL fixes from Halasz Sandor Viktor.