Moved to commonlib and fixed all the tests
Now the scenario calculator exports a ses_collection too
Tasks with fewer assets are submitted first
Merge pull request #1439 from gem/fix-task-ordering

Tasks with fewer assets are submitted first
Fixed packager.sh
Merge branch 'master' into ses_collection-scenario
Fixed the scenario export test
Added a test for ScenarioHazardCalculator
Merge pull request #1440 from gem/ses_collection-scenario

Removed the obsolete table hzrdr.ses and small refactoring
Merged from source-and-logictree
Removed concurrent_tasks
Merged from master
Merge branch 'better-task-spawning' of github.com:gem/oq-engine into better-task-spawning