Errors should never be silenced
Removed error-silencing in run_hazard_job_sp too
Changed SupervisorLogStreamHandler to log on stdout, not stderr
Merged from trunk
When bin/openquake is called as a subprocess, use --log-level=error to avoid pollution of stderr from the progress messages
Merge pull request #1085 from gem/1153512

Real errors are masked in the qa_test since the real computation runs in a subprocess