engine2:
engine2:

Added del_risk_calc and del_haz_calc functions, which include handling for
cases where deletions are not allowed.


Former-commit-id: 69aacab66565d828516032c668559576e260fea2 [formerly b3c9367c9d4b9dd96cac4d6db906587a0c5031a3] [formerly b3c9367c9d4b9dd96cac4d6db906587a0c5031a3 [formerly 7bbde3c87f65cff735fa85c0189a2554d82413d1]]
Former-commit-id: d5731ee1485eb7c5ae1662cba024075db9c115b8
Former-commit-id: db25d597c92d0e7b09a79010637984d27d17044e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine