Rename GROUP permission to ADMIN

Rename GROUP permission to ADMIN to allow ADMIN message recipients to
accept any Control: header

db/newsgroup.sql

@@ -44,7 +44,7 @@ insert into server_permission values
     (1, 'READ'),
     (2, 'POST'),
     (3, 'KILL'),
-    (4, 'GROUP');
+    (4, 'ADMIN');
 
 create table server_user (
     id       INTEGER PRIMARY KEY NOT NULL,

lib/nntp/tiny/user.py

@@ -8,14 +8,14 @@ class UserPermission(enum.Flag):
     READ  = 1
     POST  = enum.auto()
     KILL  = enum.auto()
-    GROUP = enum.auto()
+    ADMIN = enum.auto()
 
     def __str__(self):
         return {
             1: 'READ',
             2: 'POST',
             3: 'KILL',
-            4: 'GROUP'
+            4: 'ADMIN'
         }[self.value]
 
 class User(DatabaseTable):