Migrations: Fix another dependency
Migrations: Fix frozen models and complete_apps

This allows to create migrations again using:

schemamigration accounts --auto
Migrations: Alter migration to depend on migration 0002 from accounts
Migrations: accounts.User now inherits from PermissionsMixin

Followup for 4d678d8.
Migrations: Drop table for voting app

Followup for c977e615.
UNDO    more migrations to add