Small improvements to the event based calculator [skip hazardlib][demos]
Small improvements to the event based calculator [skip hazardlib][demos]


Former-commit-id: 1e994ce06181ec33ef32fc28c40387eac631e1c3 [formerly c6226f529d407f38da5daed8621c2e2ba7439b52]
Former-commit-id: f5f46824d1396f331e1daa1bbe44bb621bfe9ce7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine