Silence source block output by default

configuration.org

@@ -2,7 +2,7 @@
 #+author: Michaël Hauspie
 #+email: michael.hauspie@univ-lille.fr
 #+language: en
-#+options: header-args :results none
+#+property: header-args :results none
 
 Some of my configuration entries where borrowed from other people, see
 [[*Acknowledgment][Acknowledgment]] section for a list.