Improved reduce_source_model [skip hazardlib]
Improved reduce_source_model [skip hazardlib]


Former-commit-id: 87b72783e27b1df562719f747026d4b653168991 [formerly 14cba447c8e8e1913a6fc0dedac4b80e954bd0cf]
Former-commit-id: ca3676e679194cd98e15375daf1ecdff99d40b56
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine