upgrade AST

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diff --git a/ast/erfa/c2tcio.c b/ast/erfa/c2tcio.c
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+#include "erfa.h"
+
+void eraC2tcio(double rc2i[3][3], double era, double rpom[3][3],
+               double rc2t[3][3])
+/*
+**  - - - - - - - - - -
+**   e r a C 2 t c i o
+**  - - - - - - - - - -
+**
+**  Assemble the celestial to terrestrial matrix from CIO-based
+**  components (the celestial-to-intermediate matrix, the Earth Rotation
+**  Angle and the polar motion matrix).
+**
+**  Given:
+**     rc2i     double[3][3]    celestial-to-intermediate matrix
+**     era      double          Earth rotation angle (radians)
+**     rpom     double[3][3]    polar-motion matrix
+**
+**  Returned:
+**     rc2t     double[3][3]    celestial-to-terrestrial matrix
+**
+**  Notes:
+**
+**  1) This function constructs the rotation matrix that transforms
+**     vectors in the celestial system into vectors in the terrestrial
+**     system.  It does so starting from precomputed components, namely
+**     the matrix which rotates from celestial coordinates to the
+**     intermediate frame, the Earth rotation angle and the polar motion
+**     matrix.  One use of the present function is when generating a
+**     series of celestial-to-terrestrial matrices where only the Earth
+**     Rotation Angle changes, avoiding the considerable overhead of
+**     recomputing the precession-nutation more often than necessary to
+**     achieve given accuracy objectives.
+**
+**  2) The relationship between the arguments is as follows:
+**
+**        [TRS] = RPOM * R_3(ERA) * rc2i * [CRS]
+**
+**              = rc2t * [CRS]
+**
+**     where [CRS] is a vector in the Geocentric Celestial Reference
+**     System and [TRS] is a vector in the International Terrestrial
+**     Reference System (see IERS Conventions 2003).
+**
+**  Called:
+**     eraCr        copy r-matrix
+**     eraRz        rotate around Z-axis
+**     eraRxr       product of two r-matrices
+**
+**  Reference:
+**
+**     McCarthy, D. D., Petit, G. (eds.), 2004, IERS Conventions (2003),
+**     IERS Technical Note No. 32, BKG
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   double r[3][3];
+
+
+/* Construct the matrix. */
+   eraCr(rc2i, r);
+   eraRz(era, r);
+   eraRxr(rpom, r, rc2t);
+
+   return;
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  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.
+**  
+*/