message: Fix sphinx error on Azure and Appveyor
diff: @@ -44,6 +44,8 @@ extensions = [
  'sphinx_paramlinks',
  ]
  +bibtex_bibfiles = ['../../biblio/bibliography.bib']
  +
  todo_include_todos = True
  # plot option : do not show hyperlinks (Source code, png, hires.png, pdf)
  plot_html_show_source_link = False
  