Package all applications if no arguments

When using the 'package' command, of course.

persoconf/main.py

@@ -707,7 +707,12 @@ if args.command == "package":
 
     pkgname = args.pkgname
 
-    # TODO app == None => package all apps
+    # If no app is given: package all apps
+    if args.apps == []:
+        log.info("Packaging all apps")
+        args.apps = persoconf.list_apps(logger=log)
+
+    # Some apps were specified, so we list them with their files
     appmetas = []
     for app in args.apps :
         # Load app META file