Fri 11 Jun 2021 : updated ts_divdif.adb, ts_powtrc.adb, ts_traces.adb,
  and ts_dvdexp.adb for compiler errors.  Defined interpolators.gpr to
  build all test procedures.

Sat 19 Sep 2015 : in {dobldobl,quaddobl}_trace_interpolators.adb, bug fix
  in the normalize of a polynomial, changed tuning in ts_traces.adb.
  The test ts_trapol.adb must use the new standard_lined_hypersurfaces.

Wed 16 Sep 2015 : new packages {dobldobl,quaddobl}_divided_differences to
  compute divded differences in double double and quad double precision,
  added with clause in ts_divdif.adb for compilation.

Thu 31 Jul 2014 : new packages {dobldobl,quaddobl}_power_traces
  and {dobldobl,quaddobl}_univariate_interpolators, tested by ts_powtrc.adb.
  New packages {dobl,quad}dobl_{nvariate,trace}_interpolators,
  tested by ts_traces.

Fri 13 Jun 2014 : changed standard_polynomial_interpolators.adb for change
  in the specification of QRLS.

Sun 29 May 2011 : changed {standard,multprec}_trace_interpolators.adb
  for warnings.

Sat 8 Dec 2007 : edited multprec_trace_interpolators.adb because
  of compiler warnings.

Thu 14 Dec 2006 : because witness_points* became *sets*, ts_span.adb,
  span_of_witness_set.adb, ts_divdif.adb, ts_dvdexp.adb, ts_elim.adb,
  ts_filter.adb, ts_powtrc.adb, ts_traces.adb changed.
  ts_trapol.adb changed because of random_complex_polynomials was renamed
  into standard_random_polynomials.

Wed 14 Jun 2006 : because of warnings on AIX, changed span_of_component.ads.

Tue 11 Apr 2006 : created package span_of_witness_set, tested by ts_span.

Mon 10 Apr 2006 : modified ts_span.adb slightly, but this is extremely
  useful and should become integrated in the factorization routines!

Mon 29 Dec 2003 : changed drivers_to_embed_components in the header of
  ts_span to witness_points_io

Mon 1 Sep 2003 : modified header of multprec_subspace_restrictions.adb
  because of change in Add_Variables of Witness_Points
