Added a note about the flag all_losses
Added a note about the flag all_losses


Former-commit-id: be95ff0d6b92be9db95d381ccfbba946c6fca6ce [formerly d8c392dee145fa02bcb2e89a3b1e002a294f6527]
Former-commit-id: 1c3407464f5b9aefcce4b2490d60c6fa40784c98
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine