BUG Revert back to --cpus-per-task with SLURM

Using --ntasks actually causes srun to spawn that many tasks.
So @5 with -c 10 actually ran 50!! jobs.

One extra feature from using --cpus-per-task is that each thread gets
pinned to a different CPU-thread on different CPU alignments.
Probably the best for that little extra performance gain.

bin/submitjob

@@ -223,7 +223,7 @@ slurm_submit() {
 cat << EOF | ${LOCALCMD}
 #!/usr/bin/env bash
 #SBATCH --array=${JOB_COUNT}
-#SBATCH --ntasks=${CORES}
+#SBATCH --cpus-per-task=${CORES}
 #SBATCH -N ${NODES}
 #SBATCH --mem-per-cpu=${MEM}M
 #SBATCH -o ${LOGFILE}