Add `ixc_accounts` to `SOUTH_MIGRATION_MODULES` setting.
Move optional (private and internal) apps from `base` to `project` settings.
Rename `ixc_assets` to `ixc_content_types`.
Replace duplicate dependency comments with a note to check `requirements.txt`.
Move `feincmstools` to `IxC` section of `INSTALLED_APPS` setting.
Disable `ixc_accounts`.
Use separate command to install requirements, after making virtualenv.
Tweak settings and requirements bullet points.
Refactor `requirements-unpinned.txt` and `setup.py` files.