Pascale Noyret: made the doc reading of Yams working on all systems (default system viewer is used)

src/Tools/YamsPlug/monYamsPlugDialog.py

@@ -64,16 +64,13 @@ class MonYamsPlugDialog(Ui_YamsPlugDialog,QWidget):
           maDoc=os.environ['DISTENE_YAMS_DOC_PDF']
         except Exception:
           QMessageBox.warning( self, "Help unavailable", str(maDoc) + " not found")
-        try :  
-          commande='kpdf '+maDoc
-          os.system (commande)
-        except Exception:
         old_ld=os.getenv("LD_LIBRARY_PATH")
         command="unset LD_LIBRARY_PATH;"
-          command+="okular "+maDoc+";"
+        command+="xdg-open "+maDoc+";"
         command+="export LD_LIBRARY_PATH=%s"%old_ld
         os.system(command)
 
+
   def PBOKPressed(self):
         if not(self.PrepareLigneCommande()) : return
         self.PBSavePressed(NomHypo=True)