added disaggregation results as child of HazardResult
added disaggregation results as child of HazardResult


Former-commit-id: 33d841f16050e7d02e912efb9afa5ebe996e7dbf [formerly b20fc7dd570adcdb424a8f33b94968902e4e6251]
Former-commit-id: 66dc7bb2c881927b7af3f04a75131c38c7975512
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine