Add Local process mode and fake_worker_run command

arkindex/documents/tests/tasks/test_corpus_delete.py

arkindex/process/api.py

arkindex/process/management/commands/fake_worker_run.py

...ndex/process/migrations/0064_local_process_constraints.py

arkindex/process/models.py

arkindex/process/tests/commands/test_fake_worker_run.py

arkindex/process/tests/test_process_elements.py

arkindex/process/tests/test_processes.py

arkindex/process/tests/test_repos.py

arkindex/process/tests/test_workeractivity.py

arkindex/project/argparse.py

arkindex/project/tests/test_acl_mixin.py

arkindex/project/tests/test_ponos_view.py