Added _slots_ to RuptureCollectionSource
Added _slots_ to RuptureCollectionSource


Former-commit-id: 485aa3f63f621c31865ebc0de444c6a8c7ab9a66 [formerly 9868bf1d84e02e66d915a6a67e98fd38f8117daf]
Former-commit-id: 33ab75c8841483da2afc38734988c3fc93d76771
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine