- Initialize Use_Scade by default

 * ocarina/src/backends/ocarina-backends-xtratum_conf-hardware_description.adb
   - Indicate that the error is not fatal



git-svn-id: https://tecsw.estec.esa.int/svn/taste/trunk/ocarina@3413 129961e7-ef38-4bb5-a8f7-c9a525a55882