Trac #34429: fix gforge inria links in docs

It seems that gforge is gone at INRIA. On the other hand:
{{{
build/pkgs/ecm/SPKG.rst:-  [email protected] (requires
subscription)
build/pkgs/gf2x/SPKG.rst:Website: http://gf2x.gforge.inria.fr/
build/pkgs/mpc/SPKG.rst:   [email protected]
build/pkgs/mpfi/SPKG.rst:The MPFI website is located at
http://mpfi.gforge.inria.fr/
build/pkgs/mpfi/SPKG.rst:[email protected]
src/doc/en/thematic_tutorials/linear_programming.rst:`Calcul
mathematique avec Sage <http://sagebook.gforge.inria.fr>`_.
src/sage/combinat/tutorial.py:         http://sagebook.gforge.inria.fr/
src/sage/interfaces/ecm.py:http://ecm.gforge.inria.fr for more about
GMP-ECM.
src/sage/interfaces/ecm.py:        See http://ecm.gforge.inria.fr
src/sage/libs/libecm.pyx:See http://ecm.gforge.inria.fr/ for more about
GMP-ECM.
src/sage/tests/books/computational-mathematics-with-
sagemath/README:freely available from
http://sagebook.gforge.inria.fr/english.html
}}}

So it seems to me that these are either Paul @zimmerma projects (should
one use links on https://members.loria.fr/PZimmermann/ instead?) and a
sagebook - where is the online version now?

URL: https://trac.sagemath.org/34429
Reported by: dimpase
Ticket author(s): Dima Pasechnik
Reviewer(s): Matthias Koeppe

Author: Release Manager

build/pkgs/ecm/SPKG.rst

@@ -17,7 +17,7 @@ LGPL V3+
 Upstream Contact
 ----------------
 
--  ecm-discuss@lists.gforge.inria.fr (requires subscription)
+-  [email protected]
 
 Special Update/Build Instructions
 ---------------------------------

build/pkgs/gf2x/SPKG.rst

@@ -8,7 +8,7 @@ gf2x is a C/C++ software package containing routines for fast arithmetic
 in GF(2)[x] (multiplication, squaring, GCD) and searching for
 irreducible/primitive trinomials.
 
-Website: http://gf2x.gforge.inria.fr/
+Website: https://gitlab.inria.fr/gf2x/gf2x
 
 License
 -------

build/pkgs/mpc/SPKG.rst

@@ -4,7 +4,7 @@ mpc: Arithmetic of complex numbers with arbitrarily high precision and correct r
 Description
 -----------
 
-From http://www.multiprecision.org/mpc: GNU MPC is a C library for the
+From https://www.multiprecision.org/mpc: GNU MPC is a C library for the
 arithmetic of complex numbers with arbitrarily high precision and
 correct rounding of the result. It extends the principles of the
 IEEE-754 standard for fixed precision real floating point numbers to
@@ -22,11 +22,9 @@ documentation.
 Upstream Contact
 ----------------
 
-The MPC website is located at http://www.multiprecision.org/mpc .
+The MPC website is located at https://www.multiprecision.org/mpc .
 
-The MPC team can be contacted via the MPC mailing list:
-
-   [email protected]
+The MPC team can be contacted via the MPC mailing list: [email protected]
 
 Special Update/Build Instructions
 ---------------------------------

build/pkgs/mpfi/SPKG.rst

@@ -33,8 +33,7 @@ Upstream Contact
 
 http://perso.ens-lyon.fr/nathalie.revol/software.html
 
-The MPFI website is located at http://mpfi.gforge.inria.fr/
+The MPFI website is located at https://gitlab.inria.fr/mpfi/mpfi
 
-The MPFI team can be contacted via the MPFI mailing list:
-[email protected]
+The MPFI team can be contacted via the MPFI mailing list: [email protected]
 

src/doc/en/thematic_tutorials/linear_programming.rst

@@ -13,7 +13,8 @@ to reformulate an optimization (or existence) problem through linear
 constraints.
 
 This is a translation of a chapter from the book
-`Calcul mathematique avec Sage <http://sagebook.gforge.inria.fr>`_.
+`Calcul mathematique avec Sage <https://www.sagemath.org/sagebook/french.html>`_.
+This book now exists in `English, too <https://www.sagemath.org/sagebook/english.html>`_.
 
 Definition
 ----------

src/sage/combinat/tutorial.py

@@ -1842,7 +1842,7 @@
 
    .. [CMS2012] Alexandre Casamayou, Nathann Cohen, Guillaume Connan, Thierry Dumont, Laurent Fousse, François Maltey, Matthias Meulien, Marc Mezzarobba, Clément Pernet, Nicolas M. Thiéry, Paul Zimmermann
          *Calcul Mathématique avec Sage*
-         http://sagebook.gforge.inria.fr/
+         https://www.sagemath.org/sagebook/french.html
 
 .. [1]
    Or at least that should be the case; there are still many corners to

src/sage/interfaces/ecm.py

@@ -10,7 +10,7 @@
 
 Sage includes GMP-ECM, which is a highly optimized implementation of
 Lenstra's elliptic curve factorization method.  See
-http://ecm.gforge.inria.fr for more about GMP-ECM.
+https://gitlab.inria.fr/zimmerma/ecm for more about GMP-ECM.
 
 AUTHORS:
 
@@ -63,7 +63,7 @@ def __init__(self, B1=10, B2=None, **kwds):
         Create an interface to the GMP-ECM elliptic curve method
         factorization program.
 
-        See http://ecm.gforge.inria.fr
+        See https://gitlab.inria.fr/zimmerma/ecm
 
         INPUT:
 

src/sage/libs/libecm.pyx

@@ -5,7 +5,7 @@ The Elliptic Curve Method for Integer Factorization (ECM)
 
 Sage includes GMP-ECM, which is a highly optimized implementation of
 Lenstra's elliptic curve factorization method.
-See http://ecm.gforge.inria.fr/ for more about GMP-ECM.
+See https://gitlab.inria.fr/zimmerma/ecm for more about GMP-ECM.
 This file provides a Cython interface to the GMP-ECM library.
 
 AUTHORS:

src/sage/tests/books/computational-mathematics-with-sagemath/README

@@ -1,6 +1,6 @@
 This directory contains all the example code from the book
 "Computational Mathematics with SageMath" by Paul Zimmermann et al,
-freely available from http://sagebook.gforge.inria.fr/english.html
+freely available from https://www.sagemath.org/sagebook/english.html
 
 Each file corresponds to a chapter of the book.
 The directory "sol" contains the code for Annex A: answers to exercises