Now the engine records the disk space occupation along with the job_stats
Merge branch 'master' of github.com:gem/oq-engine into save-disk-space
Fixed engine_test.py
Small fix for risk calculations
Merged from calc_num_task_fix
Merge pull request #1308 from gem/save-disk-space

Save in job_stats how much the database increased during the current computation
Merge branch 'master' of https://github.com/gem/oq-engine into dump-import-ses