always sort the produced config files

src/registry.py

@@ -192,7 +192,7 @@ def join(names):
 class Group(object):
     """A group; it doesn't hold a value unless handled by a subclass."""
     def __init__(self, help='', supplyDefault=False,
-                 orderAlphabetically=False, private=False):
+                 orderAlphabetically=True, private=False):
         self._help = utils.str.normalizeWhitespace(help)
         self._name = 'unset'
         self._added = []