Migrate from Camelot 12.06.29 to the latest version

• Replace all imports from elixir with import from camelot.core.orm. This should cover most use cases of Elixir, use cases that are not covered in the new module (inheritance, elixir extensions) should be rebuild using Declarative. Notice that it is still possible to continue using Elixir, but not encouraged. This is a good time to move your code base over to Declarative.

• If the embedded=True field attribute is in use, this should be removed, as it is no longer supported. The proposed alternative is to use the camelot.admin.object_admin.ObjectAdmin.get_compounding_objects() method on the admin to display multiple objects in the same form.

• Database migration commands for the changed batch job model:

  CREATE TABLE `batchjob_status` (
    `status_datetime` date DEFAULT NULL,
    `status_from_date` date DEFAULT NULL,
    `status_thru_date` date DEFAULT NULL,
    `from_date` date NOT NULL,
    `thru_date` date NOT NULL,
    `classified_by` int(11) NOT NULL,
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `status_for_id` int(11) NOT NULL,
    PRIMARY KEY (`id`),
    KEY `status_for_id` (`status_for_id`),
    KEY `ix_batchjob_status_classified_by` (`classified_by`),
    CONSTRAINT `batchjob_status_ibfk_1` FOREIGN KEY (`status_for_id`) REFERENCES `batch_job` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
  );
  ALTER TABLE `batch_job` DROP COLUMN `status`;