In salloc, sbatch, and srun replace --task-mem options with --mem-per-cpu

    (--task-mem will continue to be accepted for now, but is not documented).
    Replace DefMemPerTask and MaxMemPerTask with DefMemPerCPU, DefMemPerNode,
    MaxMemPerCPU and MaxMemPerNode in slurm.conf. Allocate a job's memory memory
    at the same time that processors are allocated based upon the --mem or
    --mem-per-cpu option rather than when job steps are initiated.