Add settings for old ara migration. Add local settings import.
Modify models on account. Add migration script for accounts.
Give superuser permissions to sysops
Implement Hasher for old ARA style password hash.

 * This hasher is now primary for compatibility, but we should deprecate
this hasher ASAP. It should be replaced with PBKDF2 (default) very soon.
Add migration script for main/models.py

  * Welcome, Link model are deleted. They are not used on old ara
architecture.
Add migration script for board/models.py
Set raw_id_fields options on admin whose fk refs user/article.

 - User and Article table can be really large. Django admin originally
tries to render all possible options for that foreign key in one
combobox, which has more than 10k rows. raw_id_fields will
disable such features for specified fields.
Merge pull request #1 from hodduc/migrate

Migrate script for old ara arch