Sync zoneinfo database with tzdata2011d from elsie.nci.nih.gov

Sync zoneinfo database with tzdata2011d from elsie.nci.nih.gov

australasia:    8.22 -> 8.23
etcetera:       8.2  -> 8.3
europe:         8.27 -> 8.28
northamerica:   8.41 -> 8.42

* australasia: Samoa's DST will end on April 2, instead of April 3, as
    previously assumed. Thanks to Raymond Hughes for information on the
    change.

* etcetera: Remove obsolete material on angle brackets in the TZ
    environment variable.

* europe: Due to a nationwide exam on March 27, Turkey will change into
    summer time zone one day later.

* northamerica: Cuba will start DST on March 20, one week later than
    previously assumed. Thanks to Steffen Thorsen for the first report
    of the change.