Saved memory in the hazard getters by collecting only the distinct GMFs
Merge branch 'master', remote-tracking branch 'origin' into faster-hazard-getters
Cosmetic changes
Addressed Luigi's comment in https://github.com/gem/oq-engine/pull/1178
Added another comment
Merge pull request #1178 from gem/faster-hazard-getters

Saved memory in the hazard getters by returning only the distinct GMFs