Added Exposure.read [skip hazardlib]
Added Exposure.read [skip hazardlib]


Former-commit-id: 9ca3464231286fa8c3be2b7f16eac27d542b2cda [formerly 9ca3464231286fa8c3be2b7f16eac27d542b2cda [formerly 327b8782bc210c84960134c7a03c77b4f9849d29]]
Former-commit-id: b34681cd5d88b896766c7e428a80646f4c4ff96f
Former-commit-id: 4889d31e7e5e515a5772454b15044ca9187818f3
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine