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

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


Former-commit-id: bc5aac657ece0b95b9ffc30133562daa83fb53ac
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine