Sync zoneinfo database with tzdata2019a from ftp://ftp.iana.org/tz/releases

Sync zoneinfo database with tzdata2019a from ftp://ftp.iana.org/tz/releases

* Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
  previously predicted.

* Metlakatla rejoined Alaska Time (from previously Pacific Standard Time)
  on 2019-01-20.

* Affecting older timestamps only: Israel observed DST in 1980 and 1984.

For a detailed list of changes, see share/zoneinfo/NEWS.