The following describes the most significant changes which
occurred in the AST library between versions V7.3.4 and V8.0.0:
- AST is now distributed under the Lesser GPL licence.
- The PolyMapPolyMap class now uses files copied from the C/C++ Minpack
package (see http://devernay.free.fr/hacks/cminpack/index.html) to perform
least squares fitting of N-dimensional polynomials.
- Use of the IAU SOFA library has been replaced by ERFA library, which is
a re-badged copy of SOFA distributed under a less restrictive license. A
copy of ERFA is included within AST.