Sync zoneinfo database with tzdata2008d from elsie.

Sync zoneinfo database with tzdata2008d from elsie.

africa:         8.11 -> 8.13
asia:           8.20 -> 8.21
australasia:    8.8  -> 8.9
europe:         8.12 -> 8.14
northamerica:   8.23 -> 8.24
southamerica:   8.19 -> 8.26
zone.tab:       8.16 -> 8.18

From Arthur David Olson's and Paul Eggert's comments:

Changes affecting current and future time stamps:

* africa: changes to reflect Mauritius' 2008-2009 DST experiment

* southamerica and zone.tab: changes to reflect Brazilian time zone
  realignments

* America/Eirunepe also changed from ACT (UTC-5) to AMT (UTC-4) on June 24

Changes affecting past time stamps:

* For Mauritius, also include the 1982/1983 DST as reported by
  Steffen Thorsen

* For America/Argentina/San_Luis, redo the history from 1990 through 2000
  to match what's in Shanks & Pottenger

The following changes should not affect externally visible behavior:

* australasia, europe and southamerica: changes by Halasz Sandor Viktor to
  fix URLs

* Redo comments about Brazil to make it clearer about what west Para contains

* Update Brazil comments to mention Decree 6,212 (2007-09-26)

* Make comments a bit more concise for Brazil and Mauritius

* Redo comments about Argentina to reflect the fact that San Luis is now
  separate

* Redo the daylight-saving rules for Berlin in 1945 to make it clearer that
  these are for the Soviet Zone, not for Berlin in general

* Redo Bahamas rules to make it clearer that the rules after 1975 are the
  same as the US

* Add comments about time in China from 1949 to 1980
  (Thanks to Thomas S. Mullaney for this.)