main ins no longer needed in command

- MAIN is automatically replaced by the basename of the home directory
- when %(ins) is omitted in *_command, it is also replaced by this
+ add help subcommand

__init__.py

@@ -58,6 +58,9 @@ def run(group, arglist):
         managers = {cls.group: cls() for cls in all if cls.group + '_command' in defaults}
         serv = managers[group]
         arglist = arglist + ['']  # add dummy argument
+        if arglist[0].endswith('help'):
+           serv.usage()
+           return
         action = arglist.pop(0) if hasattr(serv, 'do_' + arglist[0]) else 'gui'
         instance = arglist.pop(0) if arglist[0] and arglist[0] not in serv.services else None
         if instance is None and len(serv.info) == 1: