modified conf/fifo-singlejob.conf: number of machines and logs-path.
hadoop restarted conditionally (based on config file field) in
src/run-schedulers.py and src/run-sched-singlejob.py.
renamed src/run-schedulers.py to src/run-sched-multiplejobs.py.
workload logs are no longer in different dirs.
added compute-0-4.local to list of hda machines.
scheduler.checkDb() adjusted for use by src/run-sched-multiplejobs.py scheduler.
hadoop logs and db checked after run - reruns test if checks fail.