Sat 9 Dec 2023 : added package hexadobl_parameter_systems.

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

Wed 9 Jun 2021 : defined sweep.gpr to build the test procedures.

Sun 8 Nov 2020 : updated parameter_homotopy_continuation.adb for the renaming
  of drivers_for_poly_continuation into main_poly_continuation.

Fri 25 Sep 2020 : defined {pent,octo,deca}dobl_parameter_systems.

Wed 23 Sep 2020 : defined tripdobl_parameter_systems.

Mon 22 Oct 2018 : added new procedures to *parameter_systems.a* to read
  solutions and parameter homotopies without writing to an output file.

Sat 27 Feb 2016 : changes in complex_convex_continuation.adb for changes in
  the increment-and-fix continuation in standard double precision.

Thu 5 Nov 2015 : added silent version needed for the real sweep in
  standard_quad_turn_points and standard_quad_sweepers.
  Added also silent versions in {dobldobl,quaddobl}_quad_turn_points
  and {dobldobl,quaddobl}_quad_sweepers.

Fri 30 Oct 2015 : factored out code of parameter_homotopy_continuation into
  the new package complex_convex_continuation.  Added silent versions to
  the procedures in complex_convex_continuation.

Tue 27 Oct 2015 : completed ts_parcon and ts_realcont with the proper calls to 
  the double double and quad ouble versions of the test procedures.
  Removed a redundant message from parameter_homotopy_continuation.adb.

Mon 26 Oct 2015 : new packages dobldobl_quad_{parameters, turn_points}_{io}
  to sweep a real curve in double double precision for singularities.
  Extended computation of quadratic turning points and the sweeping for
  singular points to quad double precision, with new packages
  quaddobl_quad_{parameters, turn_points, turn_points_io},
  and {dobldobl, quaddobl}_quad_sweepers, called in the procedures of
  the package parameter_homotopy_continuation.

Sun 25 Oct 2015 : new packages {dobldobl,quaddobl}_parameter_solutions,
  for use in parameter_homotopy_continuation, updated with wrappers for a
  convex-parameter homotopy continuation in double double or quad double
  precision.  Updated parameter_homotopy_continuation for dd & qd.

Sat 24 Oct 2015 : updated parameter_homotopy_continuation to make room for
  double double and quad double versions.  Renaming of system_with_parameters
  into standard_parameter_systems changed parameter_homotopy_continuation.adb
  and ts_parcon.  Renamed solutions_with_parameters into standard_parameter_
  solutions, which caused parameter_homotopy_continuation.adb to change.
  New packages {dobldobl,quaddobl}_parameter_systems, tested by ts_parcon.

Wed 26 Jun 2013 : updated parameter_homotopy_continuation.adb for
  Increment_and_Fix_Continuation name change.  Also updated
  systems_with_parameters, solutions_with_parameters,
  parameter_homotopy_continuation and ts_parcon.adb.

Mon 21 Jan 2013 : creation of this directory, moving code involving sweep
  and parameter continuation from Continuation to this new directory Sweep.
