upgrade AST

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diff --git a/ast/erfa/taiutc.c b/ast/erfa/taiutc.c
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--- a/ast/erfa/taiutc.c
+++ /dev/null
@@ -1,168 +0,0 @@
-#include "erfa.h"
-
-int eraTaiutc(double tai1, double tai2, double *utc1, double *utc2)
-/*
-**  - - - - - - - - - -
-**   e r a T a i u t c
-**  - - - - - - - - - -
-**
-**  Time scale transformation:  International Atomic Time, TAI, to
-**  Coordinated Universal Time, UTC.
-**
-**  Given:
-**     tai1,tai2  double   TAI as a 2-part Julian Date (Note 1)
-**
-**  Returned:
-**     utc1,utc2  double   UTC as a 2-part quasi Julian Date (Notes 1-3)
-**
-**  Returned (function value):
-**                int      status: +1 = dubious year (Note 4)
-**                                  0 = OK
-**                                 -1 = unacceptable date
-**
-**  Notes:
-**
-**  1) tai1+tai2 is Julian Date, apportioned in any convenient way
-**     between the two arguments, for example where tai1 is the Julian
-**     Day Number and tai2 is the fraction of a day.  The returned utc1
-**     and utc2 form an analogous pair, except that a special convention
-**     is used, to deal with the problem of leap seconds - see the next
-**     note.
-**
-**  2) JD cannot unambiguously represent UTC during a leap second unless
-**     special measures are taken.  The convention in the present
-**     function is that the JD day represents UTC days whether the
-**     length is 86399, 86400 or 86401 SI seconds.  In the 1960-1972 era
-**     there were smaller jumps (in either direction) each time the
-**     linear UTC(TAI) expression was changed, and these "mini-leaps"
-**     are also included in the ERFA convention.
-**
-**  3) The function eraD2dtf can be used to transform the UTC quasi-JD
-**     into calendar date and clock time, including UTC leap second
-**     handling.
-**
-**  4) The warning status "dubious year" flags UTCs that predate the
-**     introduction of the time scale or that are too far in the future
-**     to be trusted.  See eraDat for further details.
-**
-**  Called:
-**     eraUtctai    UTC to TAI
-**
-**  References:
-**
-**     McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
-**     IERS Technical Note No. 32, BKG (2004)
-**
-**     Explanatory Supplement to the Astronomical Almanac,
-**     P. Kenneth Seidelmann (ed), University Science Books (1992)
-**
-**  Copyright (C) 2013-2016, NumFOCUS Foundation.
-**  Derived, with permission, from the SOFA library.  See notes at end of file.
-*/
-{
-   int big1;
-   int i, j;
-   double a1, a2, u1, u2, g1, g2;
-
-
-/* Put the two parts of the TAI into big-first order. */
-   big1 = ( tai1 >= tai2 );
-   if ( big1 ) {
-      a1 = tai1;
-      a2 = tai2;
-   } else {
-      a1 = tai2;
-      a2 = tai1;
-   }
-
-/* Initial guess for UTC. */
-   u1 = a1;
-   u2 = a2;
-
-/* Iterate (though in most cases just once is enough). */
-   for ( i = 0; i < 3; i++ ) {
-
-   /* Guessed UTC to TAI. */
-      j = eraUtctai(u1, u2, &g1, &g2);
-      if ( j < 0 ) return j;
-
-   /* Adjust guessed UTC. */
-      u2 += a1 - g1;
-      u2 += a2 - g2;
-   }
-
-/* Return the UTC result, preserving the TAI order. */
-   if ( big1 ) {
-      *utc1 = u1;
-      *utc2 = u2;
-   } else {
-      *utc1 = u2;
-      *utc2 = u1;
-   }
-
-/* Status. */
-   return j;
-
-}
-/*----------------------------------------------------------------------
-**  
-**  
-**  Copyright (C) 2013-2016, NumFOCUS Foundation.
-**  All rights reserved.
-**  
-**  This library is derived, with permission, from the International
-**  Astronomical Union's "Standards of Fundamental Astronomy" library,
-**  available from http://www.iausofa.org.
-**  
-**  The ERFA version is intended to retain identical functionality to
-**  the SOFA library, but made distinct through different function and
-**  file names, as set out in the SOFA license conditions.  The SOFA
-**  original has a role as a reference standard for the IAU and IERS,
-**  and consequently redistribution is permitted only in its unaltered
-**  state.  The ERFA version is not subject to this restriction and
-**  therefore can be included in distributions which do not support the
-**  concept of "read only" software.
-**  
-**  Although the intent is to replicate the SOFA API (other than
-**  replacement of prefix names) and results (with the exception of
-**  bugs;  any that are discovered will be fixed), SOFA is not
-**  responsible for any errors found in this version of the library.
-**  
-**  If you wish to acknowledge the SOFA heritage, please acknowledge
-**  that you are using a library derived from SOFA, rather than SOFA
-**  itself.
-**  
-**  
-**  TERMS AND CONDITIONS
-**  
-**  Redistribution and use in source and binary forms, with or without
-**  modification, are permitted provided that the following conditions
-**  are met:
-**  
-**  1 Redistributions of source code must retain the above copyright
-**    notice, this list of conditions and the following disclaimer.
-**  
-**  2 Redistributions in binary form must reproduce the above copyright
-**    notice, this list of conditions and the following disclaimer in
-**    the documentation and/or other materials provided with the
-**    distribution.
-**  
-**  3 Neither the name of the Standards Of Fundamental Astronomy Board,
-**    the International Astronomical Union nor the names of its
-**    contributors may be used to endorse or promote products derived
-**    from this software without specific prior written permission.
-**  
-**  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-**  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-**  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-**  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
-**  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-**  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-**  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-**  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-**  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-**  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-**  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-**  POSSIBILITY OF SUCH DAMAGE.
-**  
-*/