Further simplifications
Implemented the distribution by ses and fixed the tests by increasing the number of iterations when needed
Restored the source splitting
Restored source splitting
Merged from change_distribution
Merge branch 'export-gmf_agg' into change_distribution_phase_2
Fixed test_task_arg_gen
Fixed an error message
Moved the filtering of sources back in the task
Moved the filtering inside stochastic_event_set_poissonian
Merge branch 'master' of github.com:gem/oq-engine into change_distribution_phase_2
Merge branch 'remove_filter_by_rupture' into change_distribution_phase_2
Restored the filtering by ruptures
Promoted a log message from DEBUG to INFO
Removed some excessive logging
Fixed filtering
Changed the order of the sources
Merged from master
Fixed the progress log and the number of tasks
Merge branch 'purge-gmf-tables' into change_distribution_phase_2