calcs/hazard/classical/core:
calcs/hazard/classical/core:

Added mean curve, quantile curve, and weighted quantile curve post-processing
functions.


Former-commit-id: 6197f9e9ca87eca9c673085a0fcdcdbfed209977 [formerly bc5aac657ece0b95b9ffc30133562daa83fb53ac]
Former-commit-id: 39c0ba6dfd18a0785d460c493d9925923adea89c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine