update URLs and use https where possible

Author: akhmerov

AUTHORS.rst

@@ -8,8 +8,8 @@ The principal developers of Kwant are
 
 * `Christoph Groth <mailto:christoph.groth@cea.fr>`_ (CEA Grenoble)
 * `Michael Wimmer <https://michaelwimmer.org>`_ (TU Delft)
-* `Anton Akhmerov <http://antonakhmerov.org>`_ (TU Delft)
-* `Xavier Waintal <http://www.pheliqs.fr/en/Pages/Portrait/Xavier-Waintal.aspx>`_ (CEA Grenoble)
+* `Anton Akhmerov <https://antonakhmerov.org>`_ (TU Delft)
+* `Xavier Waintal <https://www.pheliqs.fr/en/Pages/Portrait/Xavier-Waintal.aspx>`_ (CEA Grenoble)
 * `Joseph Weston <https://joseph.weston.cloud>`_ (TU Delft)
 
 Contributors to Kwant include
@@ -34,7 +34,7 @@ Contributors to Kwant include
 
 We thank Christoph Gohlke for the creation of installers for Microsoft Windows.
 
-`CEA <http://www.cea.fr>`_ is the French Commissariat à l'énergie atomique et aux
+`CEA <https://www.cea.fr>`_ is the French Commissariat à l'énergie atomique et aux
 énergies alternatives.  The CEA is the copyright holder for the contributions of
 C. W. Groth, X. Waintal, and its other employees involved in Kwant.
 

CITING.rst

@@ -15,7 +15,7 @@ cite the main paper that introduces Kwant:
   C. W. Groth, M. Wimmer, A. R. Akhmerov, X. Waintal,
   *Kwant: a software package for quantum transport*,
   `New J. Phys. 16, 063065 (2014)
-  <https://iopscience.iop.org/1367-2630/16/6/063065/article>`_.
+  <https://doi.org/10.1088/1367-2630/16/6/063065>`_.
 
 
 Other references we ask you to consider
@@ -26,7 +26,7 @@ also cite the upcoming paper that describes the relevant algorithms. The
 reference will also be added here once it is available.
 
 Kwant owes much of its current performance to the use of the `MUMPS
-<http://graal.ens-lyon.fr/MUMPS/>`_ library for solving systems of sparse linear
+<https://graal.ens-lyon.fr/MUMPS/>`_ library for solving systems of sparse linear
 equations.  If you have done high-performance calculations, we suggest citing
 
   P. R. Amestoy, I. S. Duff, J. S. Koster, J. Y. L’Excellent, SIAM. J. Matrix