change code position
delete comment-outs
new method: Master#init
fix parse_opt, add option: NOACTION_QUEUE_PRIORITY, NUM_NOACTION_THREADS, MAX_GFWHERE_WORKER,MASTER_HOSTNAME, fix option: THREAD_CREATE_INTERVAL
new class: NoActionShell NoActionQueue, rename ELifoQueueArray to RankQueueArray
new class: WorkerPool for gfwhere