Fixed docstrings and further cleanup
Fixed docstrings and further cleanup


Former-commit-id: e1512c568a773e37a8332f2b6cde6d440d1f80c9 [formerly e1512c568a773e37a8332f2b6cde6d440d1f80c9 [formerly 9c8ec37112058cffdb7421e4395407f352e05b61]]
Former-commit-id: 62ef5bcf538f24c9b5b975ed13ab9d65d4cb7782
Former-commit-id: 128da4a2c83cec652fcb0bad2b6ef5765ea2b957
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine