Configure run time decay

Procedure

Specify HIST_HOURS for the queue in lsb.queues or for the cluster in lsb.params.
Specify RUN_TIME_DECAY=Y for the queue in lsb.queues or for the cluster in lsb.params.
The run time used in the calculation of the dynamic priority so that the formula becomes the following:
```
dynamic priority = number_shares / (cpu_time * CPU_TIME_FACTOR  
+ (historical_run_time + run_time) * RUN_TIME_FACTOR
+ (1 + job_slots) * RUN_JOB_FACTOR
+ fairshare_adjustment(struct*shareAdjustPair)*FAIRSHARE_ADJUSTMENT_FACTOR)
```
run_time—(measured in hours) of running jobs accumulated in the user’s share account file. LSF calculates the decayed run time using the actual run time of running jobs and a decay factor such that 1 hour of recently-used run time decays to 0.1 hours after an interval of time specified by HIST_HOURS for the queue in lsb.queues or for the cluster in lsb.params (5 hours by default).