add default group to user at creation + custom perms

aircox/settings.py

@@ -6,6 +6,14 @@ from django.conf import settings
 def ensure (key, default):
     globals()[key] = getattr(settings, key, default)
 
+# name of the group assigned by default to all users that are created
+ensure('AIRCOX_DEFAULT_USER_GROUP', 'Radio Hosts')
+ensure('AIRCOX_DEFAULT_USER_GROUP_PERMS', (
+    'change_program', 'change_diffusion',
+    'change_sound',
+    'add_track', 'change_track', 'delete_track',
+    'add_tag', 'change_tag', 'delete_tag',
+))
 
 # Directory for the programs data
 ensure('AIRCOX_PROGRAMS_DIR',