reset activity on DEFINED status

atdb/taskdatabase/models.py

atdb/taskdatabase/services/activities_handler.py

atdb/taskdatabase/templates/taskdatabase/index.html

atdb/taskdatabase/tests/test_models_processed_summary.py

atdb/taskdatabase/tests/test_summary_tasks.py

atdb/taskdatabase/tests/test_update_activity.py