Remove traces of south (now unused)

helios/south_migrations/0001_initial.py

...uth_migrations/0002_v3_1_new_election_and_voter_fields.py

...ions/0003_v3_1_election_specific_voters_with_passwords.py

helios/south_migrations/0004_v3_1_remove_voter_fields.py

helios/south_migrations/0005_add_quarantine_fields.py

...voter_vote__add_unique_voter_voter_login_id_election__.py

...voterfile_voter_file_content__chg_field_voterfile_vote.py

...igrations/0008_auto__add_unique_trustee_election_email.py

...th_migrations/0009_auto__add_field_election_help_email.py

...s/0010_auto__add_field_election_randomize_answer_order.py

...ations/0011_auto__add_field_election_election_info_url.py

...tions/0012_auto__add_field_election_result_released_at.py

helios/south_migrations/__init__.py

helios_auth/south_migrations/0001_initial.py

helios_auth/south_migrations/__init__.py

settings.py