[gen] Created param config.groupsForGlobalRoles that disabled by default creation of a group for every global role. On a appy class it is now possible to define a static method 'generateUid' that generates a UID for every instance of this class, instead of using the standard Appy way to produce such UIDs. [shared] dav.Resource: allow to retrieve the result encoded or not in utf8.

fields/string.py

@@ -262,6 +262,7 @@ class String(Field):
             if letter.match(c): nv += str(ord(c.upper()) - 55)
             else: nv += c
         return int(nv) % 97 == 1
+
     @staticmethod
     def BIC(obj, value):
         '''Checks that p_value corresponds to a valid BIC number. BIC stands