tzcode: update to 2016a

Change LIC_CHKSUM_FILES to License. Some files are BSD clause 3

Changes affecting build procedure

An installer can now combine leap seconds with use of the backzone file,
e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
The old 'make posix_packrat' rule is now marked as obsolescent.
(Thanks to Ian Abbott for an initial implementation.)

Changes affecting documentation and commentary

A new file LICENSE makes it easier to see that the code and data
are mostly public-domain.  (Thanks to James Knight.) The three
non-public-domain files now use the current (3-clause) BSD license
instead of older versions of that license.

tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
on editing tz source files (with a mention of Sublime zoneinfo,
thanks to Gilmore Davidson).

The Theory and asia files now mention the 2015 book "The Global
Transformation of Time, 1870-1950", and cite a couple of reviews.

The America/Chicago entry now documents the informal use of US
central time in Fort Pierre, South Dakota.  (Thanks to Rick
McDermid, Matt Johnson, and Steve Jones.)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

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