Added workflow_registry to keep track of all workflows running for osg-blast module. regisitry allows stoping all workflows.
Made osg-blast signal handler to stop all workflows before existing.
Added event handler for Evict events.
Added release call for job abort event - I am not sure if I can even release a job that is aborted, so this is an experiement.
Not sorting the final merged output for osg-blast-merge6 .. I can't think of a reason why I needed to sort the final merge