Added AreaSource.get_bounding_box
Added AreaSource.get_bounding_box


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Former-commit-id: fb74ffa2132d1324bfd3c7279a17ce6e0eb7457b
Former-commit-id: b331117520f4b97c6e42bdd38221d565f6028d9d
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine