add related_names to fks to Output
add related_names to fks to Output


Former-commit-id: dbc6e58ea37808184144d783da80e9c902d1948c [formerly 6f576911af5916e5550353cc9983ed4670ec5f54]
Former-commit-id: 79bcc45e5acb44e226bcf90a1285f1e07247e611
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine