Added a view dupl_sources [skip hazardlib][demos]
Added a view dupl_sources [skip hazardlib][demos]


Former-commit-id: 7e7ef0590bab5f0a459cbd29256f25ca5fa99f67 [formerly f3398cce766524debebf83203e1a4eab0cd3f50f]
Former-commit-id: acb891829743b6096ce6119ae2a25bc7dd265795
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine