Add flag whether linked resources should be deleted in delete endpoin…

[bartvanb]

…ts that affect other resources

[frankcorneliusmartin]

✅ roles (not available in the python client)

>>> client.request('role/11', method='delete', params={'delete_dependents': True})
Making request: DELETE | http://localhost:5000/api/role/11 | {'delete_dependents': True}
Starting new HTTP connection (1): localhost:5000
http://localhost:5000 "DELETE /api/role/11?delete_dependents=True HTTP/1.1" 200 42
{'msg': 'Role removed from the database.'}

✅ task (subtasks are always deleted)

>>> client.request('task/8', method='delete')
Making request: DELETE | http://localhost:5000/api/task/8 | None
Starting new HTTP connection (1): localhost:5000
http://localhost:5000 "DELETE /api/task/8 HTTP/1.1" 200 78
{'msg': 'task id=8 and its algorithm run data have been successfully deleted'}

✅ user (not available in the python client)

>>> client.request('user/1', method='delete', params={'delete_dependents': True})
Making request: DELETE | http://localhost:5000/api/user/1 | {'delete_dependents': True}
Starting new HTTP connection (1): localhost:5000
http://localhost:5000 "DELETE /api/user/1?delete_dependents=True HTTP/1.1" 200 49
{'msg': 'user id=1 is removed from the database'}

✅ collaboration (not available in the python client)

>>> client.request('collaboration/1', method='delete', params={'delete_dependents': True})
Making request: DELETE | http://localhost:5000/api/collaboration/1 | {'delete_dependents': True}
Starting new HTTP connection (1): localhost:5000
http://localhost:5000 "DELETE /api/collaboration/1?delete_dependents=True HTTP/1.1" 200 50
{'msg': 'Collaboration id=1 successfully deleted'}