[Spice_announce] Announcement of new, positive leap second for 01 January 2017

[Boris Semenov]

The International Earth Rotation Service (IERS) has announced that a 
new, positive leap second will be added at end of day (midnight) on 
December 31, 2016. This new leap second will affect time conversions for 
times occurring only on and after January 01, 2017.

The leapseconds kernels (LSK) on the NAIF server have already been 
updated accordingly. The two versions, one for Unix/Linux/Mac 
(naif0012.tls) and one for PCs running Windows (naif0012.tls.pc) are 
available from the usual location on the NAIF server: 
http://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/.

These new LSKs should be used starting now in any SPICE-based 
applications dealing with time conversions for times occurring on or 
after January 01, 2017, unless you wish to maintain consistency with a 
previously generated product.