Perform means and quantiles in memory
Fixed an error and a test
Improved monitoring
Tried to save memory in the postprocessing phase
Merge branch 'fast-hazard-stats' of github.com:gem/oq-engine into fast-hazard-stats
Merge branch 'master' of github.com:gem/oq-engine into parallel-filtering
Merge branch 'master' of github.com:gem/oq-engine into parallel-filtering
Merged from master
Logged the total weight of the source model
Merge pull request #1496 from gem/fast-hazard-stats

Perform means and quantiles in memory