A minimal change to export the GMFs iteratively
The GMFs must be ordered by default (the ordering is fast anyway)
Merge branch 'insured-stats' of http://github.com/matley/oq-engine into export-gmf-save-memory
Merge branch 'master' of github.com:gem/oq-engine into export-gmf-save-memory
Fixed the expected output in qa_tests/hazard/scenario/case_1
Small fixes
Merge branch 'export-gmf-save-memory' of github.com:gem/oq-engine into export-gmf-save-memory
Merge pull request #1279 from gem/export-gmf-save-memory

Save memory when exporting the GMF