bugfix: query in Q::fetch_all_dead_workers_with_jobs() has to reference worker table by its full name

clearer display of job_counters on the graph; removed misleading and unused remaining_job_count() and cpu_minutes_remaining()

merge reset_and_grab into one subroutine; pre-increment dependent semaphore if re-running a DONE job; use -force flag for force-running an individual job

moved special-job-reset and special-job-reclaim into the same call, removed the unnecessary fetch in between

moved specializaton call into W::run, so that death messages during specialization could be recorded in W->log_dir