Added
- The `/api/resume_url`, `/api/temp_url`, `/api/config`,
`/api/package`, and `/api/package_update_status` API endpoints.
- The `expire` and `session` parameters of `/api/login_url`.
- The `hook_on_gather()` and `hook_after_gather()` methods of
`DAList`, `DADict`, and `DASet`.
Fixed
- Bug in the `complete_elements()` method of `DADict`.
- Incomplete support for editing lists that have `auto_gather` turned
off.