Sync zoneinfo database with tzdata2013d from ftp://ftp.iana.org/tz/releases
* africa: Morocco's midsummer transitions this year are July 7 and
August 10, not July 9 and August 8. (Thanks to Andrew Paprocki.)
* asia: Israel now falls back on the last Sunday of October. (Thanks
to Ephraim Silverberg.)
* iso3166.tab: Fix typos in the entries for country codes BQ and SX.
* zone.tab: Specify Jerusalem's location more precisely; this changes
the pre-1880 times by 2 s.
* miscellaneous files: Deemphasize the significance of national borders.
Update several URLs. Spelling fixes (thanks to Kevin Lyda and
Jonathan Leffler).