calcs/hazard/general:
calcs/hazard/general:

Added `point_source_block_size` helper method to the base hazard calc class.


Former-commit-id: a28e660ad31bea2b2a5c6d53005c2652f4f1e1f8 [formerly a8c99e8b418043a4ed5fc99d94954620a341e5f6]
Former-commit-id: 6329e6ab3e3cec48a8f6cc0ef36e72f0f52279ef
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine