Import tzdata2014f from ftp://ftp.iana.org/tz/releases/tzdata2014f.tar.gz
and NEWS file from https://github.com/eggert/tz/raw/2014f/NEWS.

NetBSD's tzdata code is being moved from src/share/zoneinfo to
src/external/public-domain/tz/dist, to simplify future maintenance.

This is the same version of tzata that was previously imported to
src/share/zoneinfo.  The NEWS file has been added to the import,
although it is not distributed in the tzdata2014f.tar.gz file.