Copyright for ppl-gcc4 source package in Xenial

This is Debian GNU's prepackaged version of the Parma Polyhedra Library (PPL):
a C++ library for the manipulation of numerical abstractions.

This package has seen its final preparation for Debian by Michael Tautschnig
 using the sources obtained from 
ftp://ftp.cs.unipr.it/pub/ppl/releases/

Program Copyright (C) 2001-2006 Roberto Bagnara 
Modifications for Debian Copyright (C) 2008 Michael Tautschnig 
and Arthur Loiret .

Authors: see the CREDITS file or http://www.cs.unipr.it/ppl/Credits
for the complete list of authors.
   
License:
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

On Debian systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL-3'

This is the Debian GNU/Linux prepackaged version of the Parma
Polyhedra Library (PPL): a C++ library for the manipulation of
numerical abstractions.

For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/

The documentation of the PPL is licensed under the GNU Free Documentation
License (v1.2).

On Debian systems, the complete text of the GNU Free Documentation
License, version 1.2, can be found in /usr/share/common-licenses/GFDL-1.2.

To some files (listed below), a license as follows applies:

Copyright (C) 2001-2006 Roberto Bagnara 

This file is free software; as a special exception the author gives
unlimited permission to copy and/or distribute it, with or without
modifications, as long as this notice is preserved.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

This license applies to:

src/Linear_Expression.types.hh
src/Coefficient_traits_template.hh
src/Poly_Gen_Relation.types.hh
src/C_Polyhedron.types.hh
src/GMP_Integer.types.hh
src/Ptr_Iterator.types.hh
src/Variable.types.hh
src/Linear_System.types.hh
src/Constraint_System.types.hh
src/Linear_Row.types.hh
src/Grid_Certificate.types.hh
src/DB_Row.types.hh
src/BHRZ03_Certificate.types.hh
src/Polyhedron.types.hh
src/fpu.types.hh
src/Determinate.types.hh
src/Coefficient.types.hh
src/Grid_Generator.types.hh
src/Congruence_System.types.hh
src/globals.types.hh
src/Grid_Generator_System.types.hh
src/Interval.types.hh
src/Scalar_Products.types.hh
src/Generator_System.types.hh
src/Powerset.types.hh
src/Congruence.types.hh
src/Checked_Number.types.hh
src/Constraint.types.hh
src/NNC_Polyhedron.types.hh
src/Topology.hh
src/Init.types.hh
src/Widening_Function.types.hh
src/Matrix.types.hh
src/H79_Certificate.types.hh
src/Generator.types.hh
src/DB_Matrix.types.hh
src/BD_Shape.types.hh
src/Row.types.hh
src/Grid.types.hh
src/Poly_Con_Relation.types.hh
tests/Partial_Function.types.hh
tests/Random_Number_Generator.types.hh
src/Pending_Element.types.hh
src/EList_Iterator.types.hh
src/EList.types.hh
src/Handler.types.hh
src/Time.types.hh
src/Doubly_Linked_Object.types.hh
src/Watchdog.types.hh
src/Pending_List.types.hh
src/OR_Matrix.types.hh
src/Interval_Info.types.hh
src/Bit_Row.types.hh
src/Pointset_Powerset.types.hh
src/iterator_to_const.types.hh
src/MIP_Problem.types.hh
src/stdiobuf.types.hh
src/Partially_Reduced_Product.types.hh
src/distances.types.hh
src/Octagonal_Shape.types.hh
src/Box.types.hh
src/Bit_Matrix.types.hh
src/Variables_Set.types.hh