Restored logic tree reduction [skip hazardlib]
Restored logic tree reduction [skip hazardlib]


Former-commit-id: b41557afc893c31246c550ff047bd79ca9429c7b [formerly b41557afc893c31246c550ff047bd79ca9429c7b [formerly 8dbea065fcbf2984854e06892de9769ac0b3f3b7]]
Former-commit-id: 7e15641926b67e30bfe5a5050a750aa3a1d73128
Former-commit-id: 11fa462d20621c913ec48c044068eb3553f0d454
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine