Resolves: #1317720
    - Rebase to 2016b
      - New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
        Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
        2016-03-27 at 02:00 local time.  They need distinct zones since their
        post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and
        Altai Republic, Russia, which will switch from +06 to +07 on the same date
        and local time.  The Astrakhan change is already official; the others have
        passed the first reading in the State Duma and are extremely likely.
        Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
      - As a trial of a new system that needs less information to be made up,
        the new zones use numeric time zone abbreviations like "+04"
        instead of invented abbreviations like "ASTT".
      - Haiti will not observe DST in 2016.
      - Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
        Guess future transitions will be March's last Saturday at 01:00, not March's
        last Friday at 24:00.