Added signal consume prior to job start for safety.

Added timeout property to Node to allow setting a maximum runtime for a given Worker.

Added new signaling system and basic capability for aborting running jobs.

Added logfile close after protected_run finish

Added stdout/stderr redirect for all workers

Added restart keyword arg to PyRunner constructor

Added on_start app lifecycle hook @app.on_start. Fixed template for driver program generator on --setup

Added app lifecycle hooks accessible via decorators (below assuming PyRunner object is app):

• @app.on_restart
• @app.on_success
• @app.on_fail
• @app.on_exit