Thu 10 Jun 2021 : added the exec_dir attribute to divisors.gpr.

Tue 8 Jun 2021 : defined divisors.gpr to build the test procedures.

Sun 6 Sep 2020 : moved the test procedures from ts_gcd, ts_intlina, ts_smith,
  ts_intinv, ts_circuit into new packages test_greatest_common_divisors,
  test_integer_linear_solvers, test_normal_forms, test_integer_inverse,
  test_integer_circuits.  Modified standard_integer_matrix_inverse.adb
  for a compiler warning.

Wed 10 Sep 2014 : made multprec_common_divisors.adb consistent with
  greatest_common_divisors.adb.

Fri 14 Jun 2013 : updates in standard_integer_linear_equalities for integer32.

Thu 13 Jun 2013 : updated standard_integer_norms.a* for integer32 and
  also modified multprec_integer_norms.adb.

Fri 7 Jun 2013 : new intlina.adb, forked off from the intmat.adb.
  Updated generic_linear_linear_solvers, multprec_integer_linear_solvers,
  {standard,multprec}_integer_matrix_inverse, tested by ts_intinv.
  Changed {standard,multprec}_smith_normal_form, tested by ts_smith;
  updated multprec_integer_norms, multprec_common_divisors.adb,
  standard_integer_circuits, tested by ts_gcd and ts_circuit.

Tue 3 Jun 2013 : edited greatest_common_divisors.adb.

Fri 23 Nov 2012 : generating all circuits works in standard_integer_circuits,
  and is tested by the program ts_circuit.adb.

Thu 22 Nov 2012 : updates in standard_integer_circuits, and in the test
  program ts_circuit.adb.

Wed 21 Nov 2012 : new directory with code copied from Matrices, the files are

generic_integer_linear_solvers.adb       standard64_common_divisors.ads
generic_integer_linear_solvers.ads       standard_common_divisors.ads
greatest_common_divisors.adb             standard_integer64_linear_solvers.ads
greatest_common_divisors.ads             standard_integer_circuits.adb
multprec64_common_divisors.ads           standard_integer_circuits.ads
multprec_common_divisors.adb             standard_integer_linear_equalities.adb
multprec_common_divisors.ads             standard_integer_linear_equalities.ads
multprec_common_divisors.ads.bak         standard_integer_linear_solvers.ads
multprec_floating64_linear_solvers.ads   standard_integer_matrix_inverse.adb
multprec_integer64_linear_solvers.ads    standard_integer_matrix_inverse.ads
multprec_integer_linear_solvers.adb      standard_integer_norms.adb
multprec_integer_linear_solvers.ads      standard_integer_norms.ads
multprec_integer_linear_solvers.ads.bak  standard_smith_normal_form.adb
multprec_integer_matrix_inverse.adb      standard_smith_normal_form.ads
multprec_integer_matrix_inverse.ads      ts_circuit.adb
multprec_integer_norms.adb               ts_gcd.adb
multprec_integer_norms.ads               ts_intinv.adb
multprec_smith_normal_form.adb           ts_smith.adb
multprec_smith_normal_form.ads
